decoder/audiofile: fix typo in comment

src/decoder/AudiofileDecoderPlugin.cxx

@@ -44,7 +44,7 @@ struct AudioFileInputStream {
 
 	size_t Read(void *buffer, size_t size) {
 		/* libaudiofile does not like partial reads at all,
-		   and wil abort playback; therefore always force full
+		   and will abort playback; therefore always force full
 		   reads */
 		return decoder_read_full(decoder, is, buffer, size)
 			? size