bin/network/arp: Fix -Wformat-security

Change-Id: Ia9ceb05b555fad32bed66ad232cc1b08a1b4a881
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3369
Reviewed-by: Adrien Destugues <[email protected]>

src/bin/network/arp/arp.cpp

@@ -181,7 +181,7 @@ list_entry(arp_control &control)
 					first = false;
 				} else
 					putchar(' ');
-				printf(kFlags[i].name);
+				fputs(kFlags[i].name, stdout);
 			}
 		}
 	}