input/*: don't allocate attribute "mime"

This was a memory leak, because "mime" was a std::string which created
another copy and discarded the allocated buffer.

src/input/CdioParanoiaInputPlugin.cxx

@@ -240,9 +240,9 @@ input_cdio_open(const char *uri,
 	i->base.size = (i->lsn_to - i->lsn_from + 1) * CDIO_CD_FRAMESIZE_RAW;
 
 	/* hack to make MPD select the "pcm" decoder plugin */
-	i->base.mime = g_strdup(reverse_endian
-				? "audio/x-mpd-cdda-pcm-reverse"
-				: "audio/x-mpd-cdda-pcm");
+	i->base.mime = reverse_endian
+		? "audio/x-mpd-cdda-pcm-reverse"
+		: "audio/x-mpd-cdda-pcm";
 
 	return &i->base;
 }

src/input/DespotifyInputPlugin.cxx

@@ -60,7 +60,7 @@ struct DespotifyInputStream {
 		memset(&pcm, 0, sizeof(pcm));
 
 		/* Despotify outputs pcm data */
-		base.mime = g_strdup("audio/x-mpd-cdda-pcm");
+		base.mime = "audio/x-mpd-cdda-pcm";
 		base.ready = true;
 	}
 

src/input/FfmpegInputPlugin.cxx

@@ -53,7 +53,7 @@ struct FfmpegInputStream {
 		   - since avio.h doesn't tell us the MIME type of the
 		   resource, we can't select a decoder plugin, but the
 		   "ffmpeg" plugin is quite good at auto-detection */
-		base.mime = g_strdup("audio/x-mpd-ffmpeg");
+		base.mime = "audio/x-mpd-ffmpeg";
 	}
 
 	~FfmpegInputStream() {

src/input/MmsInputPlugin.cxx

@@ -45,7 +45,7 @@ struct MmsInputStream {
 		 mms(_mms), eof(false) {
 		/* XX is this correct?  at least this selects the ffmpeg
 		   decoder, which seems to work fine*/
-		base.mime = g_strdup("audio/x-ms-wma");
+		base.mime = "audio/x-ms-wma";
 
 		base.ready = true;
 	}