batman-adv: Fix use of seq_has_overflowed()
net-next commit 6d91147d ("batman-adv: Remove uses of return value of seq_printf") incorrectly changed the overflow occurred return from -1 to 1. Change it back so that the test of batadv_write_buffer_text's return value in batadv_gw_client_seq_print_text works properly. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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