bug in app/gimpdrawable.c

[Paul E.C. Melis]

The function gimp-drawable-type-with-alpha wasn't
completely guarded. Calling it with a non-existent
drawable would cause a crash.

--- gimp-cvs-2601-2000/app/gimpdrawable.c Mon Jan 31 22:57:32 2000
+++ gimp-patches/app/gimpdrawable.c Mon Jan 31 22:57:54 2000
@@ -277,9 +277,13 @@
 GimpImageType
 gimp_drawable_type_with_alpha (GimpDrawable *drawable)
 {
-  GimpImageType type = gimp_drawable_type (drawable);
+  GimpImageType type;
+  gboolean has_alpha;
 
-  gboolean has_alpha = gimp_drawable_has_alpha (drawable);
+  type = gimp_drawable_type (drawable);
+  if (type == -1)
+    return 0;
+  has_alpha = gimp_drawable_has_alpha (drawable);
 
   if (has_alpha)
     return type;