8292778: EncodingSupport_md.c convertUtf8ToPlatformString wrong placing of free

Reviewed-by: rriggs, kevinw, amenkov

Author: MBaesken

src/java.instrument/windows/native/libinstrument/EncodingSupport_md.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2004, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2004, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -76,8 +76,8 @@ convertUtf8ToPlatformString(char* utf8_str, int utf8_len, char* platform_str, in
                 if (plen >= 0) {
                     platform_str[plen] = '\0';
                 }
-                free(wstr);
             }
+            free(wstr);
         }
     }
     return plen;