[libc++][test] Fix another -Wstring-concatenation warning

GitOrigin-RevId: 2916dd5669e7700eff41c891916d6030511cef3e
diff --git a/test/libcxx/fuzzing/partial_sort.pass.cpp b/test/libcxx/fuzzing/partial_sort.pass.cpp
index a1c7d4e..3f6fef1 100644
--- a/test/libcxx/fuzzing/partial_sort.pass.cpp
+++ b/test/libcxx/fuzzing/partial_sort.pass.cpp
@@ -16,7 +16,7 @@
 #include "../../../fuzzing/fuzzing.cpp"
 
 const char* test_cases[] = {"", "s", "bac",
-                            "bacasf"
+                            "bacasf",
                             "lkajseravea",
                             "adsfkajdsfjkas;lnc441324513,34535r34525234"};