remove extra newline from perror() calls

perror error adds a newline, so don't split error message
across two lines.
diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index d1c6620..6dc61eb 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -317,7 +317,7 @@
 static int flush_update(void)
 {
 	if (rtnl_send(&rth, filter.flushb, filter.flushp) < 0) {
-		perror("Failed to send flush request\n");
+		perror("Failed to send flush request");
 		return -1;
 	}
 	filter.flushp = 0;
diff --git a/ip/ipneigh.c b/ip/ipneigh.c
index db684f5..b40de5b 100644
--- a/ip/ipneigh.c
+++ b/ip/ipneigh.c
@@ -88,7 +88,7 @@
 static int flush_update(void)
 {
 	if (rtnl_send(&rth, filter.flushb, filter.flushp) < 0) {
-		perror("Failed to send flush request\n");
+		perror("Failed to send flush request");
 		return -1;
 	}
 	filter.flushp = 0;
diff --git a/ip/iproute.c b/ip/iproute.c
index 7a885b0..685cb85 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -113,7 +113,7 @@
 static int flush_update(void)
 {
 	if (rtnl_send(&rth, filter.flushb, filter.flushp) < 0) {
-		perror("Failed to send flush request\n");
+		perror("Failed to send flush request");
 		return -1;
 	}
 	filter.flushp = 0;
diff --git a/ip/xfrm_policy.c b/ip/xfrm_policy.c
index 419ca67..b5e5c3f 100644
--- a/ip/xfrm_policy.c
+++ b/ip/xfrm_policy.c
@@ -784,7 +784,7 @@
 			}
 
 			if (rtnl_send(&rth, xb.buf, xb.offset) < 0) {
-				perror("Failed to send delete-all request\n");
+				perror("Failed to send delete-all request");
 				exit(1);
 			}
 			if (show_stats > 1)