GLSL: Fix bug setting component=0 for an auto-location assignment.

Setting component=0 is later taken to mean the shader did so, which
is not always legal. It should instead set the component as not set
by the shader.

glslang/MachineIndependent/ParseHelper.cpp

@@ -5893,7 +5893,7 @@ void TParseContext::fixBlockLocations(const TSourceLoc& loc, TQualifier& qualifi
                     if (nextLocation >= (int)TQualifier::layoutLocationEnd)
                         error(memberLoc, "location is too large", "location", "");
                     memberQualifier.layoutLocation = nextLocation;
-                    memberQualifier.layoutComponent = 0;
+                    memberQualifier.layoutComponent = TQualifier::layoutComponentEnd;
                 }
                 nextLocation = memberQualifier.layoutLocation + intermediate.computeTypeLocationSize(*typeList[member].type);
             }