drivers/net/wan: fix sparse warning: make symbol static
Fix this sparse warning: drivers/net/wan/x25_asy.c:623:5: warning: symbol 'x25_asy_esc' was not declared. Should it be static? Signed-off-by: NHannes Eder <hannes@hanneseder.net> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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