interfaces: include <errno.h> to use errno

This fix previous commit. See:
 https://travis-ci.org/vincentbernat/lldpd/jobs/203148213

diff --git a/src/daemon/interfaces-bpf.c b/src/daemon/interfaces-bpf.c
index d9d193ba1edb4b4e284f276c631ae59704b7af61..5237ee75370e3493b887ef0030d0a607992c2a75 100644 (file)
--- a/src/daemon/interfaces-bpf.c
+++ b/src/daemon/interfaces-bpf.c
@@ -17,6 +17,7 @@
 
 #include "lldpd.h"
 #include <unistd.h>
+#include <errno.h>
 #include <net/bpf.h>
 
 struct bpf_buffer {