net: Drop #ifdef in parse_args()

Use IS_ENABLED() to avoid an extra build path.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/cmd/net.c b/cmd/net.c
index f980448..6d1c637 100644
--- a/cmd/net.c
+++ b/cmd/net.c
@@ -368,13 +368,13 @@
 		}
 		break;
 
-#ifdef CONFIG_CMD_TFTPPUT
 	case 4:
-		if (parse_addr_size(argv, addrp, sizep))
-			return 1;
-		*fnamep = argv[3];
-		break;
-#endif
+		if (IS_ENABLED(CONFIG_CMD_TFTPPUT)) {
+			if (parse_addr_size(argv, addrp, sizep))
+				return 1;
+			*fnamep = argv[3];
+			break;
+		}
 	default:
 		return 1;
 	}