use the "bool" data type instead of "int"

"bool" should be used in C99 programs for boolean values.

src/inputPlugins/flac_plugin.c

@@ -427,9 +427,9 @@ static int oggflac_decode(struct decoder *decoder, InputStream * inStream)
 	return flac_decode_internal(decoder, inStream, 1);
 }
 
-static unsigned int oggflac_try_decode(InputStream * inStream)
+static bool oggflac_try_decode(InputStream * inStream)
 {
-	return (ogg_stream_type_detect(inStream) == FLAC) ? 1 : 0;
+	return ogg_stream_type_detect(inStream) == FLAC;
 }
 
 static const char *oggflac_suffixes[] = { "ogg", "oga", NULL };

src/inputPlugins/mp4_plugin.c

@@ -103,12 +103,12 @@ static int mp4_decode(struct decoder * mpd_decoder, InputStream * inStream)
 	unsigned int initial = 1;
 	float *seekTable;
 	long seekTableEnd = -1;
-	int seekPositionFound = 0;
+	bool seekPositionFound = false;
 	long offset;
 	uint16_t bitRate = 0;
-	int seeking = 0;
+	bool seeking = false;
 	double seek_where = 0;
-	int initialized = 0;
+	bool initialized = false;
 
 	mp4cb = xmalloc(sizeof(mp4ff_callback_t));
 	mp4cb->read = mp4_inputStreamReadCallback;
@@ -189,7 +189,7 @@ static int mp4_decode(struct decoder * mpd_decoder, InputStream * inStream)
 
 	for (sampleId = 0; sampleId < numSamples; sampleId++) {
 		if (decoder_get_command(mpd_decoder) == DECODE_COMMAND_SEEK) {
-			seeking = 1;
+			seeking = true;
 			seek_where = decoder_seek_where(mpd_decoder);
 		}
 
@@ -219,10 +219,10 @@ static int mp4_decode(struct decoder * mpd_decoder, InputStream * inStream)
 		file_time += ((float)dur) / scale;
 
 		if (seeking && file_time > seek_where)
-			seekPositionFound = 1;
+			seekPositionFound = true;
 
 		if (seeking && seekPositionFound) {
-			seekPositionFound = 0;
+			seekPositionFound = false;
 			decoder_clear(mpd_decoder);
 			seeking = 0;
 			decoder_command_finished(mpd_decoder);
@@ -259,7 +259,7 @@ static int mp4_decode(struct decoder * mpd_decoder, InputStream * inStream)
 			audio_format.channels = frameInfo.channels;
 			decoder_initialized(mpd_decoder, &audio_format,
 					    total_time);
-			initialized = 1;
+			initialized = true;
 		}
 
 		if (channels * (unsigned long)(dur + offset) > frameInfo.samples) {

src/inputPlugins/oggflac_plugin.c

@@ -283,14 +283,14 @@ static struct tag *oggflac_TagDup(char *file)
 	return data.tag;
 }
 
-static unsigned int oggflac_try_decode(InputStream * inStream)
+static bool oggflac_try_decode(InputStream * inStream)
 {
 	if (!inStream->seekable)
 		/* we cannot seek after the detection, so don't bother
 		   checking */
-		return 1;
+		return true;
 
-	return (ogg_stream_type_detect(inStream) == FLAC) ? 1 : 0;
+	return ogg_stream_type_detect(inStream) == FLAC;
 }
 
 static int oggflac_decode(struct decoder * mpd_decoder, InputStream * inStream)

src/inputPlugins/oggvorbis_plugin.c

@@ -365,14 +365,14 @@ static struct tag *oggvorbis_TagDup(char *file)
 	return ret;
 }
 
-static unsigned int oggvorbis_try_decode(InputStream * inStream)
+static bool oggvorbis_try_decode(InputStream * inStream)
 {
 	if (!inStream->seekable)
 		/* we cannot seek after the detection, so don't bother
 		   checking */
-		return 1;
+		return true;
 
-	return (ogg_stream_type_detect(inStream) == VORBIS) ? 1 : 0;
+	return ogg_stream_type_detect(inStream) == VORBIS;
 }
 
 static const char *oggvorbis_Suffixes[] = { "ogg","oga", NULL };

src/inputPlugins/wavpack_plugin.c

@@ -417,7 +417,7 @@ initInputStreamPlus(InputStreamPlus *isp, struct decoder *decoder,
 /*
  * Tries to decode the specified stream, and gives true if managed to do it.
  */
-static unsigned int wavpack_trydecode(InputStream *is)
+static bool wavpack_trydecode(InputStream *is)
 {
 	char error[ERRORLEN];
 	WavpackContext *wpc;
@@ -427,13 +427,13 @@ static unsigned int wavpack_trydecode(InputStream *is)
 	wpc = WavpackOpenFileInputEx(&mpd_is_reader, &isp, NULL, error,
 	                             OPEN_STREAMING, 0);
 	if (wpc == NULL)
-		return 0;
+		return false;
 
 	WavpackCloseFile(wpc);
 	/* Seek it back in order to play from the first byte. */
 	seekInputStream(is, 0, SEEK_SET);
 
-	return 1;
+	return true;
 }
 
 static int wavpack_open_wvc(struct decoder *decoder,