Fix bad comment from r207573.

llvm-svn: 207854
diff --git a/clang/lib/Analysis/ScanfFormatString.cpp b/clang/lib/Analysis/ScanfFormatString.cpp
index 18505e2..32d35cd 100644
--- a/clang/lib/Analysis/ScanfFormatString.cpp
+++ b/clang/lib/Analysis/ScanfFormatString.cpp
@@ -50,7 +50,7 @@
     }
   }
 
-  // Special case: "]^" are the first characters.
+  // Special case: "^]" are the first characters.
   if (I + 1 != E && I[0] == '^' && I[1] == ']') {
     I += 2;
     if (I == E) {