NL_SET_ERR_MSG() and NL_SET_ERR_MSG_ATTR() lead to the following warning
in newer versions of gcc:
  warning: array initialized from parenthesized string constant
Just remove the parentheses, they're not needed in this context since
anyway since there can be no operator precendence issues or similar.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
  * to the lack of an output buffer.)
  */
 #define NL_SET_ERR_MSG(extack, msg) do {               \
-       static const char __msg[] = (msg);              \
+       static const char __msg[] = msg;                \
        struct netlink_ext_ack *__extack = (extack);    \
                                                        \
        if (__extack)                                   \
 } while (0)
 
 #define NL_SET_ERR_MSG_ATTR(extack, attr, msg) do {    \
-       static const char __msg[] = (msg);              \
+       static const char __msg[] = msg;                \
        struct netlink_ext_ack *__extack = (extack);    \
                                                        \
        if (__extack) {                                 \