ALSA: parisc: Fix assignment in if condition

PARISC harmony driver code contains an assignment in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.

This patch is merely for coding-style fixes, no functional changes.

Link: https://lore.kernel.org/r/20210608140540.17885-67-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>