liquidio: remove set but not used variable 'irh'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/ethernet/cavium/liquidio/request_manager.c: In function 'lio_process_iq_request_list':
drivers/net/ethernet/cavium/liquidio/request_manager.c:383:27: warning:
 variable 'irh' set but not used [-Wunused-but-set-variable]
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Acked-by: NFelix Manlunas <felix.manlunas@cavium.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/liquidio/request_manager.c

@@ -380,7 +380,6 @@ lio_process_iq_request_list(struct octeon_device *oct,
 	u32 inst_count = 0;
 	unsigned int pkts_compl = 0, bytes_compl = 0;
 	struct octeon_soft_command *sc;
-	struct octeon_instr_irh *irh;
 	unsigned long flags;
 
 	while (old != iq->octeon_read_index) {
@@ -402,14 +401,6 @@ lio_process_iq_request_list(struct octeon_device *oct,
 		case REQTYPE_RESP_NET:
 		case REQTYPE_SOFT_COMMAND:
 			sc = buf;
-
-			if (OCTEON_CN23XX_PF(oct) || OCTEON_CN23XX_VF(oct))
-				irh = (struct octeon_instr_irh *)
-					&sc->cmd.cmd3.irh;
-			else
-				irh = (struct octeon_instr_irh *)
-					&sc->cmd.cmd2.irh;
-
 			/* We're expecting a response from Octeon.
 			 * It's up to lio_process_ordered_list() to
 			 * process  sc. Add sc to the ordered soft