xdp: Handle frame_sz in xdp_convert_zc_to_xdp_frame()

In commit 34cc0b338a61 we only handled the frame_sz in convert_to_xdp_frame().
This patch will also handle frame_sz in xdp_convert_zc_to_xdp_frame().

Fixes: 34cc0b338a61 ("xdp: Xdp_frame add member frame_sz and handle in convert_to_xdp_frame")
Signed-off-by: Hangbin Liu <[e-mail]>
Signed-off-by: Alexei Starovoitov <[e-mail]>
Acked-by: Jesper Dangaard Brouer <[e-mail]>
Acked-by: John Fastabend <[e-mail]>
Link: https://lore.kernel.org/bpf/[e-mail]

net/core/xdp.c

···
 	xdpf->len = totsize - metasize;
 	xdpf->headroom = 0;
 	xdpf->metasize = metasize;
+	xdpf->frame_sz = PAGE_SIZE;
 	xdpf->mem.type = MEM_TYPE_PAGE_ORDER0;
 
 	xsk_buff_free(xdp);