Revert bogus change in 2011-07-28T21:49:16Z!eggert@cs.ucla.edu.

* src/frame.c (x_set_frame_parameters): Revert bogus change introduced
in 2012-05-25 commit by Paul Eggert.

Fixes: debbugs:11738

src/ChangeLog

+2012-07-18  Chong Yidong  <cyd@gnu.org>
+
+	* frame.c (x_set_frame_parameters): Revert bogus change introduced
+	in 2012-05-25 commit by Paul Eggert (Bug#11738).
+
 2012-07-18  Dmitry Antipov  <dmantipov@yandex.ru>
 
 	Return more descriptive data from Fgarbage_collect.

src/frame.c

@@ -2868,7 +2868,7 @@ x_set_frame_parameters (FRAME_PTR f, Lisp_Object alist)
     }
 
   /* Don't die if just one of these was set.  */
-  if (! TYPE_RANGED_INTEGERP (int, left))
+  if (EQ (left, Qunbound))
     {
       left_no_change = 1;
       if (f->left_pos < 0)
@@ -2876,7 +2876,7 @@ x_set_frame_parameters (FRAME_PTR f, Lisp_Object alist)
       else
 	XSETINT (left, f->left_pos);
     }
-  if (! TYPE_RANGED_INTEGERP (int, top))
+  if (EQ (top, Qunbound))
     {
       top_no_change = 1;
       if (f->top_pos < 0)