Bugfix #25120 and #25119 and numerous future bugs!

Two isses:
- Material assigning to MetaBalls used wrong pointer
  (copy paste error, casting badly).
- Checking for node-material used wrong RNA pointer
  (confusing void stuff going on here!)

The error leads to corruption in data and/or random
crashes. Better update svn now!

source/blender/blenkernel/intern/material.c

@@ -445,7 +445,7 @@ Material ***give_matarar_id(ID *id)
 		return &(((Curve *)id)->mat);
 		break;
 	case ID_MB:
-		return &(((Curve *)id)->mat);
+		return &(((MetaBall *)id)->mat);
 		break;
 	}
 	return NULL;
@@ -461,7 +461,7 @@ short *give_totcolp_id(ID *id)
 		return &(((Curve *)id)->totcol);
 		break;
 	case ID_MB:
-		return &(((Curve *)id)->totcol);
+		return &(((MetaBall *)id)->totcol);
 		break;
 	}
 	return NULL;
@@ -530,6 +530,10 @@ Material *give_current_material(Object *ob, int act)
 	totcolp= give_totcolp(ob);
 	if(totcolp==NULL || ob->totcol==0) return NULL;
 	
+	if(act<0) {
+		printf("no!\n");
+	}
+	
 	if(act>ob->totcol) act= ob->totcol;
 	else if(act<=0) act= 1;
 

source/blender/editors/interface/interface_templates.c

@@ -2008,7 +2008,7 @@ static void list_item_row(bContext *C, uiLayout *layout, PointerRNA *ptr, Pointe
 		/* provision to draw active node name */
 		Material *ma, *manode;
 		Object *ob= (Object*)ptr->id.data;
-		int index= (Material**)ptr->data - ob->mat;
+		int index= (Material**)itemptr->data - ob->mat;
 		
 		/* default item with material base name */
 		uiItemL(sub, name, icon);