drm/i915: Fix vma allocator debug

Add a missing colon which I accidentally removed in the recent logging
changes.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Fixes: a10234fd ("drm/i915: Partial abandonment of legacy DRM logging macros")
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221115101730.394880-1-tvrtko.ursulin@linux.intel.com

drivers/gpu/drm/i915/i915_vma.c

@@ -73,7 +73,7 @@ static void vma_print_allocator(struct i915_vma *vma, const char *reason)
 	char buf[512];
 
 	if (!vma->node.stack) {
-		drm_dbg(&to_i915(vma->obj->base.dev)->drm
+		drm_dbg(&to_i915(vma->obj->base.dev)->drm,
 			"vma.node [%08llx + %08llx] %s: unknown owner\n",
 			vma->node.start, vma->node.size, reason);
 		return;