media: staging: atomisp: fix for sparse "using plain integer as NULL pointer" warnings

The "address" member of struct ia_css_host_data is a pointer-to-char,
so define default as NULL.
Signed-off-by: NJeremy Sowden <jeremy@azazel.net>
Signed-off-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/atomisp/pci/atomisp2/css2400/runtime/isp_param/interface/ia_css_isp_param_types.h

@@ -95,7 +95,7 @@ union ia_css_all_memory_offsets {
 };
 
 #define IA_CSS_DEFAULT_ISP_MEM_PARAMS \
-		{ { { { 0, 0 } } } }
+		{ { { { NULL, 0 } } } }
 
 #define IA_CSS_DEFAULT_ISP_CSS_PARAMS \
 		{ { { { 0, 0 } } } }