Fix variable misspelling.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@51122 91177308-0d34-0410-b5e6-96231b3b80d8

utils/ccc-analyzer

@@ -122,7 +122,7 @@ def inferlanguage(extension):
       return "objective-c"
   elif extension == "mi":
       return "objective-c-cpp-output"
-  elif extention == "s":
+  elif extension == "s":
       return "skip"
   else:
       return "unknown"