Even though nonexistent cnxk_gpio is unlikely at this point
it's a good practice to check pointers before using them.
Fixes: 0e6557b448fa ("raw/cnxk_gpio: add self test")
Coverity issue: 376502
Signed-off-by: Tomasz Duszynski <tduszynski@marvell.com>
Reviewed-by: Jerin Jacob <jerinj@marvell.com>
ee05a93e1e