[SCSI] libsrp: fix typo -- replace RDAM by RDMA

Fixed a typo in libsrp.c: replaced two occurrences of 'RDAM' by 'RDMA'.

Signed-off-by: Bart Van Assche <bart.vanassche@gmail.com>
Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>