hamradio: fix macro redefine warning

MIPS/IA64 define END as assembly function ending, which conflict
with END definition in mkiss.c, just undef it at first

Reported-by: [email protected]
Signed-off-by: Huang Pei <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: mips-hp

drivers/net/hamradio/mkiss.c

@@ -31,6 +31,8 @@
 
 #define AX_MTU		236
 
+/* some arch define END as assembly function ending, just undef it */
+#undef	END
 /* SLIP/KISS protocol characters. */
 #define END             0300		/* indicates end of frame	*/
 #define ESC             0333		/* indicates byte stuffing	*/