Staging: go7007: Move a dereference below a NULL test

In each case, if the NULL test is necessary, then the dereference should be
moved below the NULL test.

The semantic patch that makes this change is as follows:
(http://www.emn.fr/x-info/coccinelle/).  The result has been modified to
move the initialization of usb down closer to where it is used.

// <smpl>
@@
type T;
expression E;
identifier i,fld;
statement S;
@@

- T i = E->fld;
+ T i;
  ... when != E
      when != i
  if (E == NULL) S
+ i = E->fld;
// </smpl>
Signed-off-by: NJulia Lawall <julia@diku.dk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/go7007/s2250-board.c

@@ -149,7 +149,7 @@ static int go7007_usb_vendor_request(struct go7007 *go, u16 request,
 static int write_reg(struct i2c_client *client, u8 reg, u8 value)
 {
 	struct go7007 *go = i2c_get_adapdata(client->adapter);
-	struct go7007_usb *usb = go->hpi_context;
+	struct go7007_usb *usb;
 	int rc;
 	int dev_addr = client->addr;
 	u8 *buf;
@@ -164,6 +164,7 @@ static int write_reg(struct i2c_client *client, u8 reg, u8 value)
 	if (buf == NULL)
 		return -ENOMEM;
 
+	usb = go->hpi_context;
 	if (down_interruptible(&usb->i2c_lock) != 0) {
 		printk(KERN_INFO "i2c lock failed\n");
 		return -EINTR;
@@ -181,7 +182,7 @@ static int write_reg(struct i2c_client *client, u8 reg, u8 value)
 static int write_reg_fp(struct i2c_client *client, u16 addr, u16 val)
 {
 	struct go7007 *go = i2c_get_adapdata(client->adapter);
-	struct go7007_usb *usb = go->hpi_context;
+	struct go7007_usb *usb;
 	u8 *buf;
 	struct s2250 *dec = i2c_get_clientdata(client);
 
@@ -200,6 +201,7 @@ static int write_reg_fp(struct i2c_client *client, u16 addr, u16 val)
 
 	memset(buf, 0xcd, 6);
 
+	usb = go->hpi_context;
 	if (down_interruptible(&usb->i2c_lock) != 0) {
 		printk(KERN_INFO "i2c lock failed\n");
 		return -EINTR;