cssselector: Don't invoke undefined behavior

Avoid undefined behavior in the calculation of some
hash values. Found by gcc's undefined behavior sanitizer.

diff --git a/gtk/gtkcssselector.c b/gtk/gtkcssselector.c
index f0e91b2a5cf059fe972d6823faea3b5f436a9605..9309de5d6fd59542cef74c5267e47ec32428bb97 100644 (file)
--- a/gtk/gtkcssselector.c
+++ b/gtk/gtkcssselector.c
@@ -842,7 +842,7 @@ match_pseudoclass_position (const GtkCssSelector *selector,
 static guint
 hash_pseudoclass_position (const GtkCssSelector *a)
 {
-  return (((a->position.type << POSITION_NUMBER_BITS) | a->position.a) << POSITION_NUMBER_BITS) | a->position.b;
+  return (guint)(((((gulong)a->position.type) << POSITION_NUMBER_BITS) | a->position.a) << POSITION_NUMBER_BITS) | a->position.b;
 }
 
 static int