firmware: zynqmp: Check if rx channel dev pointer is valid

Check if rx channel dev pointer is valid and not if the address of the
pointer is valid.

Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
Link: https://lore.kernel.org/r/20220620163650.18756-1-stefan.herbrechtsmeier-oss@weidmueller.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
1 file changed