media: staging: media: atomisp: Don't abort on error in module exit path

media: staging: media: atomisp: Don't abort on error in module exit path

The function lm3554_remove() checks for the return code for
lm3554_gpio_uninit() even though this is on the exit path and exits the
function, leaving the variable flash unfreed. Print a warning instead
and free flash unconditionally.

Link: https://lore.kernel.org/linux-media/20200903183145.720727-1-alex.dewar90@gmail.com
Signed-off-by: Alex Dewar <alex.dewar90@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>