Fix a think-o in the design of the stable_XXX sort tests; only shows up for test cases > 255 elements

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@316125 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/fuzzing/fuzzing.cpp b/fuzzing/fuzzing.cpp
index d4d0e60..c441019 100644
--- a/fuzzing/fuzzing.cpp
+++ b/fuzzing/fuzzing.cpp
@@ -37,10 +37,10 @@
 
 struct stable_test {
 	uint8_t key;
-	uint8_t payload;
+	size_t payload;
 	
 	stable_test(uint8_t k) : key(k), payload(0) {}
-	stable_test(uint8_t k, uint8_t p) : key(k), payload(p) {}
+	stable_test(uint8_t k, size_t p) : key(k), payload(p) {}
 	};
 
 void swap(stable_test &lhs, stable_test &rhs)