(frame_pointer_required_p): Change return type to bool.

From-SVN: r146990

gcc/config/avr/avr-protos.h

@@ -30,7 +30,7 @@ extern int avr_ret_register (void);
 extern enum reg_class class_likely_spilled_p (int c);
 extern enum reg_class avr_regno_reg_class (int r);
 extern enum reg_class avr_reg_class_from_letter (int c);
-extern int avr_frame_pointer_required_p (void);
+extern bool avr_frame_pointer_required_p (void);
 extern void asm_globalize_label (FILE *file, const char *name);
 extern void avr_asm_declare_function_name (FILE *, const char *, tree);
 extern void order_regs_for_local_alloc (void);