drm/i915/gt: Prevent uninitialized pointer reads

Initialize rq to NULL to prevent uninitialized pointer reads.

Signed-off-by: Apoorva Singh <[email protected]>
Reviewed-by: Krzysztof Karas <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Rodrigo Vivi <[email protected]>

Author: singh-apoorva1510

drivers/gpu/drm/i915/gt/selftest_migrate.c

@@ -262,7 +262,7 @@ static int clear(struct intel_migrate *migrate,
 {
 	struct drm_i915_private *i915 = migrate->context->engine->i915;
 	struct drm_i915_gem_object *obj;
-	struct i915_request *rq;
+	struct i915_request *rq = NULL;
 	struct i915_gem_ww_ctx ww;
 	u32 *vaddr, val = 0;
 	bool ccs_cap = false;