media: atomisp: Remove redundant NULL check

Fix warnings reported by coccicheck:
./drivers/staging/media/atomisp/pci/runtime/isp_param/src/isp_param.c:159:4-10: WARNING: NULL check before some freeing functions is not needed.

Link: https://lore.kernel.org/linux-media/20201225083818.64588-1-vulab@iscas.ac.cnSigned-off-by: Xu Wang <vulab@iscas.ac.cn>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/atomisp/pci/runtime/isp_param/src/isp_param.c

@@ -155,8 +155,7 @@ ia_css_isp_param_destroy_isp_parameters(
 
 	for (mem = 0; mem < IA_CSS_NUM_MEMORIES; mem++) {
 		for (pclass = 0; pclass < IA_CSS_NUM_PARAM_CLASSES; pclass++) {
-			if (mem_params->params[pclass][mem].address)
-				kvfree(mem_params->params[pclass][mem].address);
+			kvfree(mem_params->params[pclass][mem].address);
 			if (css_params->params[pclass][mem].address)
 				hmm_free(css_params->params[pclass][mem].address);
 			mem_params->params[pclass][mem].address = NULL;