ALSA: info: remove redundant assignment to variable c

Variable c is being assigned with the value -1 that is never read,
it is assigned a new value in a following while-loop. The assignment
is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200208224206.38540-1-colin.king@canonical.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>