RuntimeDyld: Fix errant fallthrough.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174078 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
index d2310b5..bcc3df1 100644
--- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
@@ -96,6 +96,7 @@
       *p++ = (uint8_t)(ValueToWrite & 0xff);
       ValueToWrite >>= 8;
     }
+    return false;
   }
   case macho::RIT_Difference:
   case macho::RIT_Generic_LocalDifference: