media: atomisp: remove redundant NULL check

Fix below warnings reported by coccicheck:
./drivers/staging/media/atomisp/pci/atomisp_cmd.c:4269:2-8: WARNING:
NULL check before some freeing functions is not needed.
./drivers/staging/media/atomisp/pci/atomisp_cmd.c:4626:2-8: WARNING:
NULL check before some freeing functions is not needed.

Link: https://lore.kernel.org/linux-media/[e-mail]
Reported-by: Abaci Robot <[e-mail]>
Signed-off-by: Yang Li <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/staging/media/atomisp/pci/atomisp_cmd.c

···
 apply_parameter_failed:
 	if (css_param)
 		atomisp_free_css_parameters(css_param);
-	if (param)
-		kvfree(param);
+	kvfree(param);
 
 	return ret;
 }
···
 err:
 	if (ret && res)
 		ia_css_frame_free(res);
-	if (tmp_buf)
-		vfree(tmp_buf);
+	vfree(tmp_buf);
 	if (ret == 0)
 		*result = res;
 	return ret;