[PATCH] iproute: print more verbose error on route cache flush

Before:
kda@vfirst ~/devel/iproute2 $ ./ip/ip route flush cache
Cannot open "/proc/sys/net/ipv4/route/flush"

After:
kda@vfirst ~/devel/iproute2/ip $ ./ip route flush cache
Cannot open "/proc/sys/net/ipv4/route/flush": Permission denied

Signed-off-by: Denis Kirjanov <redacted>
---
 ip/iproute.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ip/iproute.c b/ip/iproute.c
index 8f49e62..abe4180 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c

@@ -1213,7 +1213,8 @@ static int iproute_flush_cache(void)
 	char *buffer = "-1";
 
 	if (flush_fd < 0) {
-		fprintf (stderr, "Cannot open \"%s\"\n", ROUTE_FLUSH_PATH);
+		fprintf (stderr, "Cannot open \"%s\": %s\n",
+				ROUTE_FLUSH_PATH, strerror(errno));
 		return -1;
 	}