Name
device_for_each_child — 
     device child iterator.
 
Synopsis
| int device_for_each_child ( | struct device * parent, | 
|  | void * data, | 
|  | int (*fn) (struct device *dev, void *data)); | 
 
Arguments
- parent
- 
     parent struct device.
     
- data
- 
     data for the callback.
     
- fn
- 
     function to be called for each device.
     
Description
   Iterate over parent's child devices, and call fn for each,
   passing it data.
   
   We check the return of fn each time. If it returns anything
   other than 0, we break out and return that value.