board/km/cent2: Fix buffer overflow when fixing MAC address

String "/soc/fman/ethernet@e8000" is 25 bytes long
and not 24 due to extra byte for null character at
the end.

Signed-off-by: Francois Berder <fberder@outlook.fr>
diff --git a/board/keymile/kmcent2/kmcent2.c b/board/keymile/kmcent2/kmcent2.c
index 572cc7b..783853d 100644
--- a/board/keymile/kmcent2/kmcent2.c
+++ b/board/keymile/kmcent2/kmcent2.c
@@ -292,7 +292,7 @@
 void fdt_fixup_fman_mac_addresses(void *blob)
 {
 	int node, ret;
-	char path[24];
+	char path[25];
 	unsigned char mac_addr[6];
 
 	/*