RDS: cleanup: remove "== NULL"s and "!= NULL"s in ptr comparisons

Favor "if (foo)" style over "if (foo != NULL)".

Signed-off-by: Andy Grover <andy.grover@oracle.com>

diff --cc net/rds/af_rds.c
Simple merge

diff --cc net/rds/bind.c
Simple merge

diff --cc net/rds/cong.c
Simple merge

diff --cc net/rds/connection.c
Simple merge

diff --cc net/rds/ib_cm.c
Simple merge

diff --cc net/rds/ib_recv.c
Simple merge

diff --cc net/rds/ib_send.c
Simple merge

diff --cc net/rds/ib_sysctl.c
Simple merge

diff --cc net/rds/info.c
Simple merge

diff --cc net/rds/iw_cm.c
Simple merge

diff --cc net/rds/iw_recv.c
Simple merge

diff --cc net/rds/iw_send.c
Simple merge

diff --cc net/rds/iw_sysctl.c
Simple merge

diff --cc net/rds/loop.c
Simple merge

diff --cc net/rds/message.c
Simple merge

diff --cc net/rds/page.c
Simple merge

diff --cc net/rds/rdma.c
Simple merge

diff --cc net/rds/recv.c
Simple merge

diff --cc net/rds/send.c
Simple merge

diff --cc net/rds/sysctl.c
Simple merge

diff --cc net/rds/tcp.c
Simple merge

diff --cc net/rds/tcp_connect.c
Simple merge

diff --cc net/rds/tcp_listen.c
Simple merge

diff --cc net/rds/tcp_recv.c
Simple merge

diff --cc net/rds/tcp_send.c
Simple merge

diff --cc net/rds/threads.c
Simple merge