Fix minor problems found by static checking.

* dispextern.h, xdisp.c (row_hash): Declare extern only if XASSERTS.
* dispnew.c (verify_row_hash): Now static.

src/ChangeLog

+2011-11-18  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Fix minor problems found by static checking.
+	* dispextern.h, xdisp.c (row_hash): Declare extern only if XASSERTS.
+	* dispnew.c (verify_row_hash): Now static.
+
 2011-11-18  Dmitry Antipov  <dmantipov@yandex.ru>
 
 	* keymap.c (Fwhere_is_internal): Add missing RETURN_UNGCPROs.

src/dispextern.h

@@ -3127,7 +3127,9 @@ void w32_init_fringe (struct redisplay_interface *);
 void w32_reset_fringes (void);
 #endif
 
+#if XASSERTS
 extern unsigned row_hash (struct glyph_row *);
+#endif
 
 /* Defined in image.c */
 

src/dispnew.c

@@ -431,7 +431,7 @@ margin_glyphs_to_reserve (struct window *w, int total_glyphs, Lisp_Object margin
 
 #if XASSERTS
 /* Return non-zero if ROW's hash value is correct, zero if not.  */
-int
+static int
 verify_row_hash (struct glyph_row *row)
 {
   return row->hash == row_hash (row);

src/xdisp.c

@@ -17950,6 +17950,9 @@ insert_left_trunc_glyphs (struct it *it)
 }
 
 /* Compute the hash code for ROW.  */
+#if !XASSERTS
+static
+#endif
 unsigned
 row_hash (struct glyph_row *row)
 {