dtappbuilder: Coverity fixes mostly related to uninitialised variables

cde/programs/dtappbuilder/src/libABobjXm/objxm_args.c

@@ -1629,6 +1629,8 @@ objxmP_set_attachment_arg(
 	    att_offset_resource = XmNbottomOffset;
 	    att_pos_resource    = XmNbottomPosition;
 	    break;
+	default:
+	    return OK;
     }
     type   = obj_get_attach_type(obj, dir);
     value  = obj_get_attach_value(obj, dir);

cde/programs/dtappbuilder/src/libABobjXm/objxm_config.c

@@ -411,7 +411,7 @@ config_attachment(
 )
 {
     ABObj        attobj;
-    ABAttachment *attachment;
+    ABAttachment *attachment = NULL;
 
     switch(dir)
     {
@@ -427,6 +427,8 @@ config_attachment(
         case AB_CP_SOUTH:
             attachment = &(obj->attachments->south);
             break;
+        default:
+            return;
     }
     if (attachment->type == AB_ATTACH_OBJ)
     {