FROMGIT: scsi: ufs: ufs-mediatek: Fix error checking in ufs_mtk_init_va09_pwr_ctrl()

The function regulator_get() returns an error pointer. Use IS_ERR() to
validate the return value.

Link: https://lore.kernel.org/r/20211222070930.9449-1-linmq006@gmail.com


Fixes: cf137b3e ("scsi: ufs-mediatek: Support VA09 regulator operations")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit 3ba880a1 git://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git

 for-next)
Bug: 204438323
Change-Id: I9b6d2fbb9d1d795f30e7873837b59dbf76569d1b
Signed-off-by: Bart Van Assche <bvanassche@google.com>