Fix console_buffer size conflict error.

The console_buffer size is declared in common/main.c as
   -- char console_buffer[CONFIG_SYS_CBSIZE + 1];
so this extern definition is wrong.
Signed-off-by: NRemy Bohmer <linux@bohmer.net>

common/hush.c

@@ -1018,7 +1018,7 @@ static void get_user_input(struct in_str *i)
 	fflush(stdout);
 	i->p = the_command;
 #else
-	extern char console_buffer[CONFIG_SYS_CBSIZE];
+	extern char console_buffer[];
 	int n;
 	static char the_command[CONFIG_SYS_CBSIZE];