ALSA: timer: Fix leak in events via snd_timer_user_ccallback

The stack object “r1” has a total size of 32 bytes. Its field
“event” and “val” both contain 4 bytes padding. These 8 bytes
padding bytes are sent to user without being initialized.

b/28980217
Git-commit: 9a47e9cff994f37f7f0dbd9ae23740d0f64f9fe6
Git-repo: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git


Signed-off-by: Kangjie Lu <kjlu@gatech.edu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Dennis Cagle <d-cagle@codeaurora.org>
(cherry picked from commit 9a47e9cff994f37f7f0dbd9ae23740d0f64f9fe6)
Change-Id: I12949efac2aba669d302908704005fb94ba7efd7