media: atomisp: remove redundant NULL check

Fix below warnings reported by coccicheck:
./drivers/staging/media/atomisp/pci/sh_css_params.c:1575:2-8: WARNING:
NULL check before some freeing functions is not needed.
./drivers/staging/media/atomisp/pci/sh_css_params.c:3006:2-8: WARNING:
NULL check before some freeing functions is not needed.

Link: https://lore.kernel.org/linux-media/1611217731-56866-1-git-send-email-abaci-bugfix@linux.alibaba.comReported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <abaci-bugfix@linux.alibaba.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

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

@@ -1575,8 +1575,7 @@ ia_css_isp_3a_statistics_map_allocate(
 	return me;
 
 err:
-	if (me)
-		kvfree(me);
+	kvfree(me);
 	return NULL;
 }
 
@@ -3006,8 +3005,7 @@ ia_css_stream_isp_parameters_uninit(struct ia_css_stream *stream)
 	}
 
 	kvfree(params);
-	if (per_frame_params)
-		kvfree(per_frame_params);
+	kvfree(per_frame_params);
 	stream->isp_params_configs = NULL;
 	stream->per_frame_isp_params_configs = NULL;