There are tests all over the SMB1 code to check that srv_send_smb fails, but it never...

There are tests all over the SMB1 code to check that srv_send_smb fails, but it never returns false.

Even if the write to the socket/fd fails, we never return false and
will keep reading stuff off of the input buffer until it is exhausted
and then we will exit.

Signed-off-by: Richard Sharpe <rsharpe@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Richard Sharpe <sharpe@samba.org>
Autobuild-Date(master): Sat Aug  3 17:41:22 CEST 2013 on sn-devel-104

(cherry picked from commit 852c9ac34dbef66d0b2619554c611157c2fab771)

Bug: https://bugzilla.samba.org/show_bug.cgi?id=10880
S3: source3/smbd/process.c::srv_send_smb() returns true on the error path.