ALSA: timer: Fix leak in events via snd_timer_user_tinterrupt

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: e4ec8cc8039a7063e24204299b462bd1383184a5
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 e4ec8cc8039a7063e24204299b462bd1383184a5)
Change-Id: I53aa15632e941199010aae670cefb65c8fd56833