ALSA: hda - Fix input-src parse in patch_analog.c

Compare pin type enum to the pin type and not the array index.
Fixes bug#0005368.

Signed-off-by: Adrian Wilkins <adrian.wilkins@nhs.net>
Cc: <stable@kernel.org> (2.6.37 and later)
Signed-off-by: Takashi Iwai <tiwai@suse.de>