IB/ipath: Make a few functions static

Make some functions that are only used in a single .c file static.  In
addition to being a cleanup, this shrinks the generated code.  On x86_64:

add/remove: 1/3 grow/shrink: 2/1 up/down: 4777/-4956 (-179)
function                                     old     new   delta
handle_errors                                  -    3994   +3994
__verbs_timer                                 42     710    +668
ipath_do_ruc_send                           2131    2246    +115
ipath_no_bufs_available                      136       -    -136
ipath_disarm_senderrbufs                     639       -    -639
ipath_ib_timer                               658       -    -658
ipath_intr                                  5878    2355   -3523

Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/ipath/ipath_verbs.h

@@ -782,8 +782,6 @@ void ipath_update_mmap_info(struct ipath_ibdev *dev,
 
 int ipath_mmap(struct ib_ucontext *context, struct vm_area_struct *vma);
 
-void ipath_no_bufs_available(struct ipath_qp *qp, struct ipath_ibdev *dev);
-
 void ipath_insert_rnr_queue(struct ipath_qp *qp);
 
 int ipath_get_rwqe(struct ipath_qp *qp, int wr_id_only);
@@ -807,8 +805,6 @@ void ipath_ib_rcv(struct ipath_ibdev *, void *, void *, u32);
 
 int ipath_ib_piobufavail(struct ipath_ibdev *);
 
-void ipath_ib_timer(struct ipath_ibdev *);
-
 unsigned ipath_get_npkeys(struct ipath_devdata *);
 
 u32 ipath_get_cr_errpkey(struct ipath_devdata *);