ALSA: usb-audio: Fix potential out-of-bound access at parsing SU

commit f658f17b5e0e339935dca23e77e0f3cad591926b upstream.

The usb-audio driver may trigger an out-of-bound access at parsing a
malformed selector unit, as it checks the header length only after
evaluating bNrInPins field, which can be already above the given
length.  Fix it by adding the length check beforehand.

Fixes: 99fc8645 ("ALSA: usb-mixer: parse descriptors with structs")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>