BUG/MINOR: spoe: Fix memory leak if failing to allocate memory

Technically harmless, but it annoys clang analyzer.

This bug was introduced in 336d3ef0e77192582c98b3c578927a529ceadd9b.
This fix should be backported to HAProxy 1.9+.

(cherry picked from commit b29861307253fcc25ed086eeb91f0723a24b282b)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
diff --git a/src/flt_spoe.c b/src/flt_spoe.c
index f20b264..4e48aa95 100644
--- a/src/flt_spoe.c
+++ b/src/flt_spoe.c
@@ -3751,6 +3751,7 @@
 				goto out;
 			}
 			if ((vph->name  = strdup(args[cur_arg])) == NULL) {
+				free(vph);
 				ha_alert("parsing [%s:%d] : out of memory.\n", file, linenum);
 				err_code |= ERR_ALERT | ERR_ABORT;
 				goto out;