system-linux: cosmetic cleanup

[project/netifd.git] / system-linux.c

diff --git a/system-linux.c b/system-linux.c
index 6e4a194..67fa2b1 100644 (file)
--- a/system-linux.c
+++ b/system-linux.c
@@ -2485,10 +2485,14 @@ int system_update_ipv6_mtu(struct device *dev, int mtu)
 {
        int ret = -1;
        char buf[64];
+       int fd;
+
        snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu",
                        dev->ifname);
 
-       int fd = open(buf, O_RDWR);
+       fd = open(buf, O_RDWR);
+       if (fd < 0)
+               return ret;
 
        if (!mtu) {
                ssize_t len = read(fd, buf, sizeof(buf) - 1);