media: staging: atomisp: ia_css_output.host: don't use var before check

Fix this warning:
	drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/output/output_1.0/ia_css_output.host.c:64 ia_css_output_config() warn: variable dereferenced before check 'from->info' (see line 63)
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/output/output_1.0/ia_css_output.host.c

@@ -60,7 +60,7 @@ ia_css_output_config(
 	(void)size;
 	ia_css_dma_configure_from_info(&to->port_b, from->info);
 	to->width_a_over_b = elems_a / to->port_b.elems;
-	to->height = from->info->res.height;
+	to->height = from->info ? from->info->res.height : 0;
 	to->enable = from->info != NULL;
 	ia_css_frame_info_to_frame_sp_info(&to->info, from->info);