[AX25]: Put back ax25digicmp.

Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ax25.h

@@ -238,6 +238,7 @@ extern ax25_address null_ax25_address;
 extern char *ax2asc(ax25_address *);
 extern ax25_address *asc2ax(char *);
 extern int  ax25cmp(ax25_address *, ax25_address *);
+extern int  ax25digicmp(ax25_digi *, ax25_digi *);
 extern unsigned char *ax25_addr_parse(unsigned char *, int, ax25_address *, ax25_address *, ax25_digi *, int *, int *);
 extern int  ax25_addr_build(unsigned char *, ax25_address *, ax25_address *, ax25_digi *, int, int);
 extern int  ax25_addr_size(ax25_digi *);

net/ax25/ax25_addr.c

@@ -120,6 +120,26 @@ int ax25cmp(ax25_address *a, ax25_address *b)
  	return 2;			/* Partial match */
 }
 
+/*
+ *	Compare two AX.25 digipeater paths.
+ */
+int ax25digicmp(ax25_digi *digi1, ax25_digi *digi2)
+{
+	int i;
+
+	if (digi1->ndigi != digi2->ndigi)
+		return 1;
+
+	if (digi1->lastrepeat != digi2->lastrepeat)
+		return 1;
+
+	for (i = 0; i < digi1->ndigi; i++)
+		if (ax25cmp(&digi1->calls[i], &digi2->calls[i]) != 0)
+			return 1;
+
+	return 0;
+}
+
 /*
  *	Given an AX.25 address pull of to, from, digi list, command/response and the start of data
  *