staging: Drop unnecessary null test

list_for_each_entry binds its first argument to a non-null value, and thus
any null test on the value of that argument is superfluous.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
iterator I;
expression x;
statement S;
@@

I(x,...) { <...
- if (x != NULL || ...)
  S
  ...> }
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/pohmelfs/config.c

@@ -301,10 +301,8 @@ static int pohmelfs_cn_dump(struct cn_msg *msg)
 
 	mutex_lock(&pohmelfs_config_lock);
 
-	list_for_each_entry(g, &pohmelfs_config_list, group_entry) {
-		if (g)
+	list_for_each_entry(g, &pohmelfs_config_list, group_entry)
 		total_msg += g->num_entry;
-	}
 	if (total_msg == 0) {
 		if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL))
 			err = -ENOMEM;
@@ -312,17 +310,18 @@ static int pohmelfs_cn_dump(struct cn_msg *msg)
 	}
 
 	list_for_each_entry(g, &pohmelfs_config_list, group_entry) {
-		if (g) {
-			list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) {
+		list_for_each_entry_safe(c, tmp, &g->config_list,
+					 config_entry) {
 			struct pohmelfs_ctl *sc = &c->state.ctl;
-				if (pohmelfs_send_reply(err, total_msg - i, POHMELFS_CTLINFO_ACK, msg, sc)) {
+			if (pohmelfs_send_reply(err, total_msg - i,
+						POHMELFS_CTLINFO_ACK, msg,
+						sc)) {
 				err = -ENOMEM;
 				goto out_unlock;
 			}
 			i += 1;
 		}
 	}
-	}
 
 out_unlock:
 	mutex_unlock(&pohmelfs_config_lock);
@@ -354,15 +353,14 @@ static int pohmelfs_cn_flush(struct cn_msg *msg)
 		}
 	} else {
 		list_for_each_entry(g, &pohmelfs_config_list, group_entry) {
-			if (g) {
-				list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) {
+			list_for_each_entry_safe(c, tmp, &g->config_list,
+						 config_entry) {
 				list_del(&c->config_entry);
 				g->num_entry--;
 				kfree(c);
 			}
 		}
 	}
-	}
 
 out_unlock:
 	mutex_unlock(&pohmelfs_config_lock);

drivers/staging/tm6000/tm6000-core.c

@@ -702,10 +702,8 @@ void tm6000_unregister_extension(struct tm6000_ops *ops)
 	struct tm6000_core *dev = NULL;
 
 	mutex_lock(&tm6000_devlist_mutex);
-	list_for_each_entry(dev, &tm6000_devlist, devlist) {
-		if (dev)
+	list_for_each_entry(dev, &tm6000_devlist, devlist)
 		ops->fini(dev);
-	}
 
 	mutex_lock(&tm6000_extension_devlist_lock);
 	printk(KERN_INFO "tm6000: Remove (%s) extension\n", ops->name);