wimax: fix printk format warnings

Fix printk format warnings in drivers/net/wimax/i2400m:

drivers/net/wimax/i2400m/control.c: warning: format '%zu' expects argument of type 'size_t', but argument 4 has type 'ssize_t' [-Wformat]
drivers/net/wimax/i2400m/control.c: warning: format '%zu' expects argument of type 'size_t', but argument 5 has type 'ssize_t' [-Wformat]
drivers/net/wimax/i2400m/usb-fw.c: warning: format '%zu' expects argument of type 'size_t', but argument 4 has type 'ssize_t' [-Wformat]

I don't see these warnings on x86.  The warnings that are quoted above
are from Geert's kernel build reports.

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc:	Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
Cc:	linux-wimax@intel.com
Cc:	wimax@linuxwimax.org
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/wimax/i2400m/usb-fw.c b/drivers/net/wimax/i2400m/usb-fw.c
index 1fda46c..e74664b 100644
--- a/drivers/net/wimax/i2400m/usb-fw.c
+++ b/drivers/net/wimax/i2400m/usb-fw.c
@@ -212,7 +212,7 @@
 	}
 	if (result != cmd_size) {		/* all was transferred? */
 		dev_err(dev, "boot-mode cmd %d: incomplete transfer "
-			"(%zu vs %zu submitted)\n",  opcode, result, cmd_size);
+			"(%zd vs %zu submitted)\n",  opcode, result, cmd_size);
 		result = -EIO;
 		goto error_cmd_size;
 	}