ALSA: sh: Fix wrong argument order for copy_from_iter()

Fix a brown paper bag bug I introduced at converting to the standard
iter helper; the arguments were wrongly passed and have to be
swapped.

Fixes: 9b5f8ee4 ("ALSA: sh: Use standard helper for buffer accesses")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202412140019.jat5Dofr-lkp@intel.com/
Link: https://patch.msgid.link/20241220114417.5898-1-tiwai@suse.de


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