gianfar: Fix the data buffer stashing amount

- Buffer stashing parameter change to 96 from 64 in order to cover
the Layer 4 header.
Signed-off-by: Dai Haruki <dai.haruki@freescale.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/gianfar.h

@@ -102,7 +102,7 @@ extern const char gfar_driver_version[];
 #define DEFAULT_FIFO_TX_STARVE 0x40
 #define DEFAULT_FIFO_TX_STARVE_OFF 0x80
 #define DEFAULT_BD_STASH 1
-#define DEFAULT_STASH_LENGTH	64
+#define DEFAULT_STASH_LENGTH	96
 #define DEFAULT_STASH_INDEX	0
 
 /* The number of Exact Match registers */