Make sure to propogate the error code when we fail to parse a modifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123857 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index 9105ad5..0b0df02 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -523,7 +523,7 @@
       Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
       if (Variant == MCSymbolRefExpr::VK_Invalid) {
         Variant = MCSymbolRefExpr::VK_None;
-        TokError("invalid variant '" + Split.second + "'");
+        return TokError("invalid variant '" + Split.second + "'");
       }
     }