common/console.c: ensure GD_FLG_SILENT is set or cleared

When CONFIG_SILENT_CONSOLE is defined and the default environment has
silent=1 it is not possible for a user to make the console un-silent if
the environment is not available when console_init_f() is called (for
example because the environment is in SPI).

Add a new helper function console_update_silent() and call it from both
console_init_f() and console_init_r().

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

common/console.c

@@ -687,15 +687,22 @@ int console_assign(int file, const char *devname)
 	return -1;
 }
 
-/* Called before relocation - use serial functions */
-int console_init_f(void)
+static void console_update_silent(void)
 {
-	gd->have_console = 1;
-
 #ifdef CONFIG_SILENT_CONSOLE
 	if (getenv("silent") != NULL)
 		gd->flags |= GD_FLG_SILENT;
+	else
+		gd->flags &= ~GD_FLG_SILENT;
 #endif
+}
+
+/* Called before relocation - use serial functions */
+int console_init_f(void)
+{
+	gd->have_console = 1;
+
+	console_update_silent();
 
 	print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT1_SERIAL);
 
@@ -831,6 +838,8 @@ int console_init_r(void)
 	struct list_head *pos;
 	struct stdio_dev *dev;
 
+	console_update_silent();
+
 #ifdef CONFIG_SPLASH_SCREEN
 	/*
 	 * suppress all output if splash screen is enabled and we have