In tcp_usr_send(), broaden coverage of the socket buffer lock in the non-OOB case so that the sbspace() check is performed under the same lock instance as the append to the send socket buffer.
In tcp_usr_send(), broaden coverage of the socket buffer lock in the
non-OOB case so that the sbspace() check is performed under the same
lock instance as the append to the send socket buffer.

MFC after:	1 week

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase