ALSA: asihpi: remove unused loop_count variable

clang with W=1 reports
sound/pci/asihpi/hpi6000.c:1256:6: error: variable
  'loop_count' set but not used [-Werror,-Wunused-but-set-variable]
        u32 loop_count = 0;
            ^
This variable is not used so remove it.

Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20230326205712.1358918-1-trix@redhat.com


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