rt2x00: Fix chipset debugfs file

Initialize blob->data before moving the data pointer
Initialize blob->size based on blob->data size

This fixes the empty chipset file in debugfs.
Signed-off-by: NIvo van Doorn <IvDoorn@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00debug.c

@@ -417,6 +417,7 @@ static struct dentry *rt2x00debug_create_file_chipset(const char *name,
 	if (!data)
 		return NULL;
 
+	blob->data = data;
 	data += sprintf(data, "rt chip: %04x\n", intf->rt2x00dev->chip.rt);
 	data += sprintf(data, "rf chip: %04x\n", intf->rt2x00dev->chip.rf);
 	data += sprintf(data, "revision:%08x\n", intf->rt2x00dev->chip.rev);
@@ -425,9 +426,7 @@ static struct dentry *rt2x00debug_create_file_chipset(const char *name,
 	data += sprintf(data, "eeprom length: %d\n", debug->eeprom.word_count);
 	data += sprintf(data, "bbp length: %d\n", debug->bbp.word_count);
 	data += sprintf(data, "rf length: %d\n", debug->rf.word_count);
-
-	blob->data = data;
-	blob->size = strlen(data);
+	blob->size = strlen(blob->data);
 
 	return debugfs_create_blob(name, S_IRUGO, intf->driver_folder, blob);
 }