[ALSA] sc6000: 2 minor fixes

This patch zeroes buffer for the card name and
fixes incorrect jump in the probe function.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>