[APPLETALK]: warning fix

drivers/net/appletalk/cops.c: In function `cops_load':
drivers/net/appletalk/cops.c:539: warning: assignment discards qualifiers from pointer target type
drivers/net/appletalk/cops.c:547: warning: assignment discards qualifiers from pointer target type

Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/appletalk/cops.h

···
 struct ltfirmware
 {
         unsigned int length;
-        unsigned char * data;
+        const unsigned char *data;
 };
 
 #define DAYNA 1