networkctl: fix strappend() error checking

Make sure to test the right variable for NULL.

diff --git a/src/network/networkctl.c b/src/network/networkctl.c
index 21e9b383b2232e71257a0ae690dbfbd5aa8d2724..15dfb81e2a260cde3af8344fc4cb7544c6825dba 100644 (file)
--- a/src/network/networkctl.c
+++ b/src/network/networkctl.c
@@ -880,7 +880,7 @@ static char *lldp_system_caps(uint16_t cap) {
         }
 
         t = strappend(s, "]");
-        if (!s)
+        if (!t)
                 return NULL;
 
         free(s);