drm/xe: Fix uninitialized pointer def

In the case where a set of checks on xe->info.platform don't assign
a value to pointer def the pointer remains uninitialized and hence
can fail the following !def check. Fix this be ensuring pointer
def is initialized to NULL.

Fixes: 292b1a8 ("drm/xe: Stop ignoring errors from xe_heci_gsc_init()")
Signed-off-by: Colin Ian King <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Lucas De Marchi <[email protected]>

Author: ColinIanKing

drivers/gpu/drm/xe/xe_heci_gsc.c

@@ -173,7 +173,7 @@ static int heci_gsc_add_device(struct xe_device *xe, const struct heci_gsc_def *
 int xe_heci_gsc_init(struct xe_device *xe)
 {
 	struct xe_heci_gsc *heci_gsc = &xe->heci_gsc;
-	const struct heci_gsc_def *def;
+	const struct heci_gsc_def *def = NULL;
 	int ret;
 
 	if (!xe->info.has_heci_gscfi && !xe->info.has_heci_cscfi)