block: drbd: drbd_main: Remove duplicate field initialisation

[P_RETRY_WRITE] is initialised more than once.

Fixes the following W=1 kernel build warning(s):

 drivers/block/drbd/drbd_main.c: In function ‘cmdname’:
 drivers/block/drbd/drbd_main.c:3660:22: warning: initialized field overwritten [-Woverride-init]
 drivers/block/drbd/drbd_main.c:3660:22: note: (near initialization for ‘cmdnames[44]’)

Cc: Philipp Reisner <philipp.reisner@linbit.com>
Cc: Lars Ellenberg <lars.ellenberg@linbit.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: drbd-dev@lists.linbit.com
Cc: linux-block@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210312105530.2219008-7-lee.jones@linaro.orgSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/drbd/drbd_main.c

@@ -3657,7 +3657,6 @@ const char *cmdname(enum drbd_packet cmd)
 		[P_RS_CANCEL]		= "RSCancel",
 		[P_CONN_ST_CHG_REQ]	= "conn_st_chg_req",
 		[P_CONN_ST_CHG_REPLY]	= "conn_st_chg_reply",
-		[P_RETRY_WRITE]		= "retry_write",
 		[P_PROTOCOL_UPDATE]	= "protocol_update",
 		[P_RS_THIN_REQ]         = "rs_thin_req",
 		[P_RS_DEALLOCATED]      = "rs_deallocated",