fix a bug in my previous patch, a classic =/== bug.

llvm-svn: 50483
diff --git a/llvm/lib/VMCore/Value.cpp b/llvm/lib/VMCore/Value.cpp
index cf696fe..e55e558 100644
--- a/llvm/lib/VMCore/Value.cpp
+++ b/llvm/lib/VMCore/Value.cpp
@@ -140,7 +140,7 @@
 /// nul terminated string.
 bool Value::isName(const char *N) const {
   unsigned InLen = strlen(N);
-  return InLen = getNameLen() && memcmp(getNameStart(), N, InLen) == 0;
+  return InLen == getNameLen() && memcmp(getNameStart(), N, InLen) == 0;
 }