bonding: fix error unwind in bonding_store_bonds

	Fixed an error unwind in bonding_store_bonds that didn't release
the locks it held, and consolidated unwinds into a common block at the
end of the function.  Bug reported by Pavel Emelyanov <xemul@openvz.org>,
who provided a different fix.
Signed-off-by: NJay Vosburgh <fubar@us.ibm.com>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

drivers/net/bonding/bond_sysfs.c

@@ -146,29 +146,29 @@ static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t
 						": Unable remove bond %s due to open references.\n",
 						ifname);
 					res = -EPERM;
-					goto out;
+					goto out_unlock;
 				}
 				printk(KERN_INFO DRV_NAME
 					": %s is being deleted...\n",
 					bond->dev->name);
 				bond_destroy(bond);
-				up_write(&bonding_rwsem);
-				rtnl_unlock();
-				goto out;
+				goto out_unlock;
 			}
 
 		printk(KERN_ERR DRV_NAME
 			": unable to delete non-existent bond %s\n", ifname);
 		res = -ENODEV;
-		up_write(&bonding_rwsem);
-		rtnl_unlock();
-		goto out;
+		goto out_unlock;
 	}
 
 err_no_cmd:
 	printk(KERN_ERR DRV_NAME
 		": no command found in bonding_masters. Use +ifname or -ifname.\n");
-	res = -EPERM;
+	return -EPERM;
+
+out_unlock:
+	up_write(&bonding_rwsem);
+	rtnl_unlock();
 
 	/* Always return either count or an error.  If you return 0, you'll
 	 * get called forever, which is bad.