Merge pull request STEllAR-GROUP#6689 from STEllAR-GROUP/fix-unreachable-wait_all

Fix unreachable code warning in wait_all

Author: hkaiser

libs/core/async_combinators/include/hpx/async_combinators/wait_all.hpp

@@ -548,7 +548,10 @@ namespace hpx {
                     new frame_type(values), false);
                 return frame->wait_all();
             }
-            return false;
+            else
+            {
+                return false;
+            }
         }
 
         template <typename T>