Fix random attended shrines in irregular rooms

doc/fixes5-0-1.txt

@@ -24,6 +24,7 @@ obey statue type gender (gnome king statue in minetn-5)
 fix statue and figurine genders in special levels in general
 fix buffer overflow in update_topl when handling multiple items in a
 	container
+fix random attended shrines in irregular rooms
 
 
 Platform- and/or Interface-Specific Fixes

src/mkroom.c

@@ -573,6 +573,8 @@ mkswamp(void) /* Michiel Huisjes & Fred de Wilde */
     }
 }
 
+/* return center of room, or a random free location
+   if center is blocked */
 staticfn coord *
 shrine_pos(int roomno)
 {
@@ -591,6 +593,14 @@ shrine_pos(int roomno)
     buf.y = troom->ly + delta / 2;
     if ((delta % 2) && rn2(2))
         buf.y++;
+
+    /* irregular room or the location is blocked */
+    if (roomno != levl[buf.x][buf.y].roomno
+        || (levl[buf.x][buf.y].typ != ROOM
+            && levl[buf.x][buf.y].typ != ICE
+            && levl[buf.x][buf.y].typ != CLOUD))
+        (void) somexyspace(troom, &buf);
+
     return &buf;
 }