znet: fix build failure from i82593.h relocation

znet was including "wireless/i82593.h" (which is a bit wierd), and I
missed that when I relocated i82593.h to drivers/staging/wavelan.  Since
I don't have ISA turned-on in my normal .config, I didn't see the build
failures -- mea culpa!

Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/znet.c b/drivers/net/znet.c
index b423473..443c4ee 100644
--- a/drivers/net/znet.c
+++ b/drivers/net/znet.c
@@ -103,8 +103,7 @@
 #include <asm/io.h>
 #include <asm/dma.h>
 
-/* This include could be elsewhere, since it is not wireless specific */
-#include "wireless/i82593.h"
+#include <linux/i82593.h>
 
 static char version[] __initdata = "znet.c:v1.02 9/23/94 becker@scyld.com\n";