Fix crash in fvmw3 due to uninitialized value

Fix first appeared on FreeBSD. Upstream discussion:
https://github.com/fvwmorg/fvwm3/issues/659

Patch from Michael (Maintainer)

x11/fvwm3/Makefile

@@ -2,7 +2,7 @@ COMMENT=	multiple virtual desktop window manager
 
 VERSION=	1.0.5
 DISTNAME=	fvwm3-${VERSION}
-REVISION=	0
+REVISION=	1
 
 CATEGORIES=     x11
 

x11/fvwm3/patches/patch-modules_FvwmIconMan_x_c

@@ -0,0 +1,11 @@
+Index: modules/FvwmIconMan/x.c
+--- modules/FvwmIconMan/x.c.orig
++++ modules/FvwmIconMan/x.c
+@@ -741,6 +741,7 @@ void X_init_manager (int man_id)
+   if (man->geometry_str) {
+     fscreen_scr_arg arg;
+     arg.mouse_ev = NULL;
++    arg.name = NULL;
+ 
+     geometry_mask = FScreenParseGeometryWithScreen(
+       man->geometry_str, &man->geometry.x, &man->geometry.y,