ALSA: opl3sa2 fix irq releasing and short name of card

Two simple fixes:

1. Use the same pointer for the free_irq() and
   the request_irq() calls.

2. A short name of card is appended with '2' or '3'
   character depending on a detected chip. Remove
   the '2' character from the short name.

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