fix a bug handling the gnu ?: extension.  Patch by Storlek on IRC,
who prefers to be stealthy and mysterious.

llvm-svn: 91888
diff --git a/clang/test/Sema/format-strings.c b/clang/test/Sema/format-strings.c
index 1ad4bda..67081b5 100644
--- a/clang/test/Sema/format-strings.c
+++ b/clang/test/Sema/format-strings.c
@@ -50,6 +50,7 @@
   printf(i == 1 ? "yes" : "no"); // no-warning
   printf(i == 0 ? (i == 1 ? "yes" : "no") : "dont know"); // no-warning
   printf(i == 0 ? (i == 1 ? s : "no") : "dont know"); // expected-warning{{format string is not a string literal}}
+  printf("yes" ?: "no %d", 1); // expected-warning{{more data arguments than '%' conversions}}
 }
 
 void check_writeback_specifier()