video: fbdev: aty128fb: use true and false for boolean values

Assign true or false to boolean variables instead of an integer value.

This issue was detected with the help of Coccinelle.
Signed-off-by: NGustavo A. R. Silva <gustavo@embeddedor.com>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: NBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

drivers/video/fbdev/aty/aty128fb.c

@@ -1716,7 +1716,7 @@ static int aty128fb_setup(char *options)
 			continue;
 		}
 		if(!strncmp(this_opt, "nomtrr", 6)) {
-			mtrr = 0;
+			mtrr = false;
 			continue;
 		}
 #ifdef CONFIG_PPC_PMAC