cmd/bedbug.c: Make bedbug_init have a return value

Do this as a preparation for removing initr_bedbug wrapper from
common/board_r.c.

Signed-off-by: Ovidiu Panait <ovpanait@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

include/bedbug/type.h

@@ -3,7 +3,7 @@
 
 /* Supporting routines */
 int bedbug_puts (const char *);
-void bedbug_init (void);
+int bedbug_init(void);
 void bedbug860_init (void);
 void do_bedbug_breakpoint (struct pt_regs *);
 void bedbug_main_loop (unsigned long, struct pt_regs *);