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: Hannes Eder <hannes@hanneseder.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
   *                    STANDARD X.25 ENCAPSULATION                      *
   ************************************************************************/
 
-int x25_asy_esc(unsigned char *s, unsigned char *d, int len)
+static int x25_asy_esc(unsigned char *s, unsigned char *d, int len)
 {
        unsigned char *ptr = d;
        unsigned char c;