Merged release 0.15.6 from branch 'v0.15.x'

Conflicts:

	NEWS
	configure.ac

src/decoder/_flac_common.c

@@ -223,11 +223,11 @@ flac_vtrack_tnum(const char* fname)
 	 * another/better way would be to use tag struct
 	 */
 	char* ptr = strrchr(fname, '_');
+	if (ptr == NULL)
+		return 0;
 
 	// copy ascii tracknumber to int
-	char vtrack[4];
-	g_strlcpy(vtrack, ++ptr, 4);
-	return (unsigned int)strtol(vtrack, NULL, 10);
+	return (unsigned int)strtol(++ptr, NULL, 10);
 }
 
 #endif /* FLAC_API_VERSION_CURRENT >= 7 */