[ICMP]: ICMP_MIB_OUTMSGS increment duplicated

Commit "96793b48" (Add ICMPMsgStats
MIB (RFC 4293)) made a mistake.

In that patch, David L added a icmp_out_count() in
ip_push_pending_frames(), remove icmp_out_count() from
icmp_reply(). But he forgot to remove icmp_out_count() from
icmp_send() too.  Since icmp_send and icmp_reply will call
icmp_push_reply, which will call ip_push_pending_frames, a duplicated
increment happened in icmp_send.

This patch remove the icmp_out_count from icmp_send too.

Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>