genetlink: cleanup code according to CodingStyle

If the function is exported, the EXPORT* macro for it should follow immediately
after the closing function brace line.

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
----
 net/netlink/genetlink.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)
Signed-off-by: David S. Miller <davem@davemloft.net>