composite.c: use 'double' consistently

* composite.c (get_composition_id): Use 'double' consistently
instead of converting 'float' to 'double' and vice versa; this is
easier to understand and avoids a GCC warning.

src/ChangeLog

+2012-04-09  Paul Eggert  <eggert@cs.ucla.edu>
+
+	composite.c: use 'double' consistently
+	* composite.c (get_composition_id): Use 'double' consistently
+	instead of converting 'float' to 'double' and vice versa; this is
+	easier to understand and avoids a GCC warning.
+
 2012-04-09  Glenn Morris  <rgm@gnu.org>
 
 	* Makefile.in: Generate leim-list with bootstrap-emacs, in

src/composite.c

@@ -355,7 +355,7 @@ get_composition_id (EMACS_INT charpos, EMACS_INT bytepos, EMACS_INT nchars,
   else
     {
       /* Rule-base composition.  */
-      float leftmost = 0.0, rightmost;
+      double leftmost = 0.0, rightmost;
 
       ch = XINT (key_contents[0]);
       rightmost = ch != '\t' ? CHAR_WIDTH (ch) : 1;
@@ -364,7 +364,7 @@ get_composition_id (EMACS_INT charpos, EMACS_INT bytepos, EMACS_INT nchars,
 	{
 	  int rule, gref, nref;
 	  int this_width;
-	  float this_left;
+	  double this_left;
 
 	  rule = XINT (key_contents[i]);
 	  ch = XINT (key_contents[i + 1]);