Fix: Memory leak in multiresbake_image_exec

MultiresBakeJob is allocated before a potential early return of the
operator, so free the data before returning.

Part of #120767

Pull Request: https://projects.blender.org/blender/blender/pulls/121102

source/blender/editors/object/object_bake.cc

@@ -561,6 +561,7 @@ static int multiresbake_image_exec(bContext *C, wmOperator *op)
 
   if (!bkr->data.first) {
     BKE_report(op->reports, RPT_ERROR, "No objects found to bake from");
+    MEM_freeN(bkr);
     return OPERATOR_CANCELLED;
   }