RDMA/bnxt_re: Initialize dpi_tbl_lock mutex

Fix the missing dpi_tbl_lock mutex initialization.

Fixes: 0ac20fa ("RDMA/bnxt_re: Reorg the bar mapping")
Link: https://lore.kernel.org/r/1691642677-21369-4-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/bnxt_re/qplib_res.c

@@ -819,6 +819,7 @@ static int bnxt_qplib_alloc_dpi_tbl(struct bnxt_qplib_res *res,
 	}
 
 	memset((u8 *)dpit->tbl, 0xFF, bytes);
+	mutex_init(&res->dpi_tbl_lock);
 	dpit->priv_db = dpit->ucreg.bar_reg + dpit->ucreg.offset;
 
 	return 0;