bootm: Update fixup_silent_linux() to return an error

At present this function fails silently on error. Update it to produce
an error code. Report this error to the user and abort the boot, since it
likely will prevent a successful start.

No tests are added at this stage, since additional refactoring is taking
place in subsequent patches.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/bootm.c b/common/bootm.c
index 0d36c57..950ff7c 100644
--- a/common/bootm.c
+++ b/common/bootm.c
@@ -468,7 +468,7 @@
 #define CONSOLE_ARG     "console="
 #define CONSOLE_ARG_LEN (sizeof(CONSOLE_ARG) - 1)
 
-void fixup_silent_linux(void)
+int fixup_silent_linux(void)
 {
 	char *buf;
 	const char *env_val;
@@ -477,7 +477,7 @@
 
 	if (!IS_ENABLED(CONFIG_SILENT_CONSOLE) &&
 	    !IS_ENABLED(CONFIG_SILENT_U_BOOT_ONLY))
-		return;
+		return 0;
 	cmdline = env_get("bootargs");
 
 	/*
@@ -489,9 +489,9 @@
 	 */
 	want_silent = env_get_yesno("silent_linux");
 	if (want_silent == 0)
-		return;
+		return 0;
 	else if (want_silent == -1 && !(gd->flags & GD_FLG_SILENT))
-		return;
+		return 0;
 
 	debug("before silent fix-up: %s\n", cmdline);
 	if (cmdline && (cmdline[0] != '\0')) {
@@ -501,7 +501,7 @@
 		buf = malloc(strlen(cmdline) + 1 + CONSOLE_ARG_LEN + 1);
 		if (!buf) {
 			debug("%s: out of memory\n", __func__);
-			return;
+			return -ENOSPC;
 		}
 
 		if (start) {
@@ -525,6 +525,8 @@
 	env_set("bootargs", env_val);
 	debug("after silent fix-up: %s\n", env_val);
 	free(buf);
+
+	return 0;
 }
 
 /**
@@ -629,8 +631,14 @@
 	if (!ret && (states & BOOTM_STATE_OS_BD_T))
 		ret = boot_fn(BOOTM_STATE_OS_BD_T, argc, argv, images);
 	if (!ret && (states & BOOTM_STATE_OS_PREP)) {
-		if (images->os.os == IH_OS_LINUX)
-			fixup_silent_linux();
+		if (images->os.os == IH_OS_LINUX) {
+			ret = fixup_silent_linux();
+			if (ret) {
+				printf("Cmdline setup failed (err=%d)\n", ret);
+				ret = CMD_RET_FAILURE;
+				goto err;
+			}
+		}
 		ret = boot_fn(BOOTM_STATE_OS_PREP, argc, argv, images);
 	}