Invert assertion condition.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@61961 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/PTHLexer.cpp b/lib/Lex/PTHLexer.cpp
index cfd5c64..a982561 100644
--- a/lib/Lex/PTHLexer.cpp
+++ b/lib/Lex/PTHLexer.cpp
@@ -146,7 +146,7 @@
 // FIXME: We can just grab the last token instead of storing a copy
 // into EofToken.
 void PTHLexer::getEOF(Token& Tok) {
-  assert(!EofToken.is(tok::eof));
+  assert(EofToken.is(tok::eof));
   Tok = EofToken;
 }