The previous replacement from simple_strtoul() to kstrtoul() forgot
that the passed pointer must be an unsigned long int pointer, while
the value used there is a sized_t pointer.  Fix it.

Fixes: 61bc4def ("ALSA: pcm: replace simple_strtoul to kstrtoul")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202409010425.YPS7cWeJ-lkp@intel.com/
Link: https://patch.msgid.link/20240901134524.27107-1-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>