gcc -Wall -O lint:

	gcc -Wall -O lint:
	* mips-tdep.c (heuristic_proc_desc): Initialize reg30 to avoid
	warning.  Unnest comment.
	(init_extra_frame_info): Remove unused variable mask.
	(MASK): Fully parenthesize.
	(mips_push_dummy_frame): Remove unused variable val.
	(mips_skip_prologue): Remove unused variables f and b.