[ALSA] Remove redundant NULL checks before kfree

Timer Midlevel,ALSA sequencer,ALSA<-OSS sequencer,Digigram VX core
I2C tea6330t,GUS Library,VIA82xx driver,VIA82xx-modem driver
CA0106 driver,CS46xx driver,EMU10K1/EMU10K2 driver,YMFPCI driver
Digigram VX Pocket driver,Common EMU synth,USB generic driver,USB USX2Y
Checking a pointer for NULL before calling kfree() on it is redundant,
kfree() deals with NULL pointers just fine.
This patch removes such checks from sound/

This patch also makes another, but closely related, change.
It avoids casting pointers about to be kfree()'ed.

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 4 insertions, 8 deletions

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index a82412b8790d..a75695045f29 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -859,10 +859,8 @@ static void release_urb_ctx(snd_urb_ctx_t *u)
                 usb_free_urb(u->urb);
                 u->urb = NULL;
         }
-        if (u->buf) {
-                kfree(u->buf);
-                u->buf = NULL;
-        }
+        kfree(u->buf);
+        u->buf = NULL;
 }
 
 /*
@@ -880,10 +878,8 @@ static void release_substream_urbs(snd_usb_substream_t *subs, int force)
                 release_urb_ctx(&subs->dataurb[i]);
         for (i = 0; i < SYNC_URBS; i++)
                 release_urb_ctx(&subs->syncurb[i]);
-        if (subs->tmpbuf) {
-                kfree(subs->tmpbuf);
-                subs->tmpbuf = NULL;
-        }
+        kfree(subs->tmpbuf);
+        subs->tmpbuf = NULL;
         subs->nurbs = 0;
 }