ALSA: pcm: Fix the previous conversion to kstrtoul()

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>

sound/core/pcm_memory.c

@@ -183,7 +183,7 @@ static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry,
 	struct snd_pcm_substream *substream = entry->private_data;
 	struct snd_card *card = substream->pcm->card;
 	char line[64], str[64];
-	size_t size;
+	unsigned long size;
 	struct snd_dma_buffer new_dmab;
 
 	guard(mutex)(&substream->pcm->open_mutex);