intel_pstate: Clean up get_target_pstate_use_performance()

The comments and the core_busy variable name in
get_target_pstate_use_performance() are totally confusing,
so modify them to reflect what's going on.

The results of the computations should be the same as before.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

path: root/screen.c

#include <curses.h>

#include "screen.h"

WINDOW *screen_init(bool israw)
{
	WINDOW *screen = initscr();

	if (israw)
		raw();
	noecho();
	cbreak();
	nodelay(screen, TRUE);
	keypad(stdscr, TRUE);
	refresh();
	wrefresh(screen);

	return screen;
}

void screen_end(void)
{
	endwin();
}