sound: oss: mpu401.c: Cleaning up missing break in a case

Added a missed break in a case statement

This was found using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/oss/mpu401.c b/sound/oss/mpu401.c
index 3bbc3ec..f1c1dc3 100644
--- a/sound/oss/mpu401.c
+++ b/sound/oss/mpu401.c
@@ -316,6 +316,7 @@
 				case 0xf6:
 					/* printk( "tune_request\n"); */
 					devc->m_state = ST_INIT;
+					break;
 
 					/*
 					 *    Real time messages