Free the allocated filename. Found by clang static analyzer.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@158514 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/profile/GCDAProfiling.c b/lib/profile/GCDAProfiling.c
index 300985f..8f92a91 100644
--- a/lib/profile/GCDAProfiling.c
+++ b/lib/profile/GCDAProfiling.c
@@ -136,6 +136,7 @@
     output_file = fopen(filename, "w+b");
     if (!output_file) {
       fprintf(stderr, "profiling:%s: cannot open\n", filename);
+      free(filename);
       return;
     }
   }