CLEANUP: spoe: Remove unused label retry

This removes the retry labels from spoe_send_frame and spoe_recv_frame
which are unused since d5216d474d69856a282e4443f180af2093a80d6c, which
is unreleased, but was backported to haproxy 1.8 as
f13f3a4babdb1ce23a7e982c765704bca728111a.
diff --git a/src/flt_spoe.c b/src/flt_spoe.c
index 8694b07..a537958 100644
--- a/src/flt_spoe.c
+++ b/src/flt_spoe.c
@@ -1125,7 +1125,6 @@
 	ret = ci_putblk(si_ic(si), buf, framesz+4);
 	if (ret <= 0) {
 		if ((ret == -3 && si_ic(si)->buf == &buf_empty) || ret == -1) {
-		  retry:
 			si_applet_cant_put(si);
 			return 1; /* retry */
 		}
@@ -1156,7 +1155,6 @@
 	}
 	if (ret <= 0) {
 		if (ret == 0) {
-		  retry:
 			return 1; /* retry */
 		}
 		SPOE_APPCTX(appctx)->status_code = SPOE_FRM_ERR_IO;