ALSA: emu10k1: Fix forgotten user-copy conversion in init code

ALSA: emu10k1: Fix forgotten user-copy conversion in init code

The commit 4d5180ce9aaa ("ALSA: emu10k1: Get rid of set_fs() usage")
converted the user-space copy hack with set_fs() to the direct
memcpy(), but one place was forgotten.  This resulted in the error
from snd_emu10k1_init_efx(), eventually failed to load the driver.
Fix the missing piece.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=196687
Fixes: 4d5180ce9aaa ("ALSA: emu10k1: Get rid of set_fs() usage")
Signed-off-by: Takashi Iwai <tiwai@suse.de>