rds: Remove redundant assignment to nr_sig

Variable nr_sig is being assigned a value however the assignment is
never read, so this redundant assignment can be removed.

Cleans up the following clang-analyzer warning:

net/rds/ib_send.c:297:2: warning: Value stored to 'nr_sig' is never read
[clang-analyzer-deadcode.DeadStores].

Reported-by: Abaci Robot <[e-mail]>
Signed-off-by: Jiapeng Chong <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/rds/ib_send.c

···
 
 	rds_ib_ring_free(&ic->i_send_ring, completed);
 	rds_ib_sub_signaled(ic, nr_sig);
-	nr_sig = 0;
 
 	if (test_and_clear_bit(RDS_LL_SEND_FULL, &conn->c_flags) ||
 	    test_bit(0, &conn->c_map_queued))