Bug from own testing (yeah, writing logs means finding bugs!)

The Curve widget flag 'premultiply' should be cleared on read. This could
lead to an occasional crash...

source/blender/blenloader/intern/readfile.c

@@ -1189,6 +1189,9 @@ static void direct_link_curvemapping(FileData *fd, CurveMapping *cumap)
 {
 	int a;
 	
+	/* flag seems to be able to hang? Maybe old files... not bad to clear anyway */
+	cumap->flag &= ~CUMA_PREMULLED;
+	
 	for(a=0; a<CM_TOT; a++) {
 		cumap->cm[a].curve= newdataadr(fd, cumap->cm[a].curve);
 		cumap->cm[a].table= NULL;