Fix printfs with too few or too many parms, remove unused vars, fix incorrect flag tests, other code cleanup.

lib/libc/ansi/misc.c

@@ -206,7 +206,7 @@ date_of(const register struct dsttype *dst, const struct tm *timep)
 
 	if (dst->ds_type != 'M') {
 		return dst->ds_date[0] -
-			    (dst->ds_type == 'J'
+			    ((dst->ds_type == 'J')
 				&& leap
 				&& dst->ds_date[0] < 58);
 	}

lib/libdriver/driver.c

@@ -385,7 +385,7 @@ message *mp;
 /*===========================================================================*
  *				nop_prepare				     *
  *===========================================================================*/
-PUBLIC struct device *nop_prepare(device)
+PUBLIC struct device *nop_prepare(int device)
 {
 /* Nothing to prepare for. */
   return(NIL_DEV);