Typo correction; no functional change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172555 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/PPMacroExpansion.cpp b/lib/Lex/PPMacroExpansion.cpp
index c626b4d..7947522 100644
--- a/lib/Lex/PPMacroExpansion.cpp
+++ b/lib/Lex/PPMacroExpansion.cpp
@@ -965,7 +965,7 @@
                                      IdentifierInfo *II, Preprocessor &PP,
                                      const DirectoryLookup *LookupFrom) {
   // Save the location of the current token.  If a '(' is later found, use
-  // that location.  If no, use the end of this location instead.
+  // that location.  If not, use the end of this location instead.
   SourceLocation LParenLoc = Tok.getLocation();
 
   // Get '('.