ALSA: echoaudio: Fix memory allocation

ALSA: echoaudio: Fix memory allocation

Orabug: 25308093

[ Upstream commit 9c6795a9b3cbb56a9fbfaf43909c5c22999ba317 ]

'commpage_bak' is allocated with 'sizeof(struct echoaudio)' bytes.
We then copy 'sizeof(struct comm_page)' bytes in it.
On my system, smatch complains because one is 2960 and the other is 3072.

This would result in memory corruption or a oops.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
(cherry picked from commit 029161e90ca98d024061cb50b0934b1ea06046b5)
Signed-off-by: Dhaval Giani <dhaval.giani@oracle.com>