Free a temporary buffer used by dsaparam application

The dsaparam application allocates a temporary buffer but then doesn't
free it.

Reviewed-by: Richard Levitte <levitte@openssl.org>

apps/dsaparam.c

@@ -244,6 +244,7 @@ int dsaparam_main(int argc, char **argv)
                             "        return NULL;\n"
                             "    }\n"
                             "    return(dsa);\n}\n");
+        OPENSSL_free(data);
     }
 
     if (!noout) {