If 'ov9640_reg_read()' does not return 0, then 'val' is left unmodified.
As it is not initialized either, the return value can be anything.

It is likely that returning the error code was expected here.
Signed-off-by: NChristophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>