Fix a SIGSEGV during initialization

During the initialisation of 4a-softmixer, when the function
'ProcessOneAvirtSubdev' fails, the function 'AttachOneLoop'
was crashing because it tried to call 'snd_ctl_close' with
a NULL pointer.

This change fixes it. A test is introduced because depending
on the kind of loop, the order of initialization of control
versus subdevs differs.

At the same time, some gotos are improved to avoid a dummy
test -this are also virtual fixes-.

Also a tiny refactor of the 3 times declared variable 'subdev'
is expected to improve the readability.

Bug-AGL: SPEC-2287

Change-Id: Ie5231a1064090d772ea0ea7d86ad8c8d79b38d72
Signed-off-by: José Bollo <jose.bollo@iot.bzh>

0 files changed, 0 insertions, 0 deletions