Bug 286185 nsFileSpecUnix::Rename leaks on failure

patch by ajschult@verizon.net r=darin sr=darin

xpcom/obsolete/nsFileSpecUnix.cpp

@@ -406,6 +406,7 @@ nsresult nsFileSpec::Rename(const char* inNewName)
     {
         // Could not rename, set back to the original.
         mPath = oldPath;
+        nsCRT::free(oldPath);
         return NS_FILE_FAILURE;
     }