IB/mlx5: Fix some spelling mistakes

Fix spelling mistakes in remarks
    "retrun"->"return"
    "Decalring"->"Declaring"

Signed-off-by: Talat Batheesh <talatb@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mlx5/mad.c

@@ -204,7 +204,7 @@ static int process_pma_cmd(struct ib_device *ibdev, u8 port_num,
 	int err;
 	void *out_cnt;
 
-	/* Decalring support of extended counters */
+	/* Declaring support of extended counters */
 	if (in_mad->mad_hdr.attr_id == IB_PMA_CLASS_PORT_INFO) {
 		struct ib_class_port_info cpi = {};