Remove useless memFree() in regExpNew().

The MEM_CONTEXT_NEW*() block will automatically free memory if there is an error.

This code is pretty old so this may not have been true when it was written.

src/common/regExp.c

@@ -89,10 +89,7 @@ regExpNew(const String *expression)
         int result = 0;
 
         if ((result = regcomp(&this->regExp, strZ(expression), REG_EXTENDED)) != 0)
-        {
-            memFree(this);
             regExpError(result);
-        }
 
         // Set free callback to ensure cipher context is freed
         memContextCallbackSet(this->memContext, regExpFreeResource, this);