fix typo

llvm-svn: 91343
diff --git a/clang/lib/Lex/Preprocessor.cpp b/clang/lib/Lex/Preprocessor.cpp
index 0c1b858..4ab0d30 100644
--- a/clang/lib/Lex/Preprocessor.cpp
+++ b/clang/lib/Lex/Preprocessor.cpp
@@ -102,7 +102,7 @@
        Macros.begin(), E = Macros.end(); I != E; ++I) {
     // We don't need to free the MacroInfo objects directly.  These
     // will be released when the BumpPtrAllocator 'BP' object gets
-    // destroyed. We still need to run the dstor, however, to free
+    // destroyed.  We still need to run the dtor, however, to free
     // memory alocated by MacroInfo.
     I->second->Destroy(BP);
     I->first->setHasMacroDefinition(false);