fastboot: remove #ifdef CONFIG when it is possible

Much of the fastboot code predates the introduction of Kconfig and
has quite a few #ifdefs in it which is unnecessary now that we can use
IS_ENABLED() et al.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Reviewed-by: Sean Anderson <sean.anderson@seco.com>
Tested-by: Mattijs Korpershoek <mkorpershoek@baylibre.com> # on vim3l
diff --git a/cmd/fastboot.c b/cmd/fastboot.c
index b498e4b..b94dbd5 100644
--- a/cmd/fastboot.c
+++ b/cmd/fastboot.c
@@ -19,8 +19,14 @@
 static int do_fastboot_udp(int argc, char *const argv[],
 			   uintptr_t buf_addr, size_t buf_size)
 {
-#if CONFIG_IS_ENABLED(UDP_FUNCTION_FASTBOOT)
-	int err = net_loop(FASTBOOT);
+	int err;
+
+	if (!CONFIG_IS_ENABLED(UDP_FUNCTION_FASTBOOT)) {
+		pr_err("Fastboot UDP not enabled\n");
+		return CMD_RET_FAILURE;
+	}
+
+	err = net_loop(FASTBOOT);
 
 	if (err < 0) {
 		printf("fastboot udp error: %d\n", err);
@@ -28,21 +34,21 @@
 	}
 
 	return CMD_RET_SUCCESS;
-#else
-	pr_err("Fastboot UDP not enabled\n");
-	return CMD_RET_FAILURE;
-#endif
 }
 
 static int do_fastboot_usb(int argc, char *const argv[],
 			   uintptr_t buf_addr, size_t buf_size)
 {
-#if CONFIG_IS_ENABLED(USB_FUNCTION_FASTBOOT)
 	int controller_index;
 	char *usb_controller;
 	char *endp;
 	int ret;
 
+	if (!CONFIG_IS_ENABLED(USB_FUNCTION_FASTBOOT)) {
+		pr_err("Fastboot USB not enabled\n");
+		return CMD_RET_FAILURE;
+	}
+
 	if (argc < 2)
 		return CMD_RET_USAGE;
 
@@ -88,10 +94,6 @@
 	g_dnl_clear_detach();
 
 	return ret;
-#else
-	pr_err("Fastboot USB not enabled\n");
-	return CMD_RET_FAILURE;
-#endif
 }
 
 static int do_fastboot(struct cmd_tbl *cmdtp, int flag, int argc,
@@ -148,17 +150,12 @@
 	return do_fastboot_usb(argc, argv, buf_addr, buf_size);
 }
 
-#ifdef CONFIG_SYS_LONGHELP
-static char fastboot_help_text[] =
+U_BOOT_CMD(
+	fastboot, CONFIG_SYS_MAXARGS, 1, do_fastboot,
+	"run as a fastboot usb or udp device",
 	"[-l addr] [-s size] usb <controller> | udp\n"
 	"\taddr - address of buffer used during data transfers ("
 	__stringify(CONFIG_FASTBOOT_BUF_ADDR) ")\n"
 	"\tsize - size of buffer used during data transfers ("
 	__stringify(CONFIG_FASTBOOT_BUF_SIZE) ")"
-	;
-#endif
-
-U_BOOT_CMD(
-	fastboot, CONFIG_SYS_MAXARGS, 1, do_fastboot,
-	"run as a fastboot usb or udp device", fastboot_help_text
 );