sound: sys_timer: indent poll_def_tmr() correctly

The indenting here was really whacky and not consistent from one line to
the next.  I also reverse the "if (opened)" and "if (tmr_running)" tests
so that I could remove two indent levels.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>