pktgen_dst_metrics[] can be static

CC: Fan Du <fan.du@windriver.com>
CC: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 45ba476..a37ec53 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -2500,7 +2500,7 @@
 
 
 #ifdef CONFIG_XFRM
-u32 pktgen_dst_metrics[RTAX_MAX + 1] = {
+static u32 pktgen_dst_metrics[RTAX_MAX + 1] = {
 
 	[RTAX_HOPLIMIT] = 0x5, /* Set a static hoplimit */
 };