net: fix documentation for kernel_getsockname

Fixes return value documentation of kernel_getsockname()
and kernel_getpeername() functions.

The previous documentation wrongly specified that the return
value is 0 in case of success, however sock->ops->getname returns
the length of the address in bytes in case of success.

Signed-off-by: Alex Maydanik <alexander.maydanik@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: alex-maydanik

net/socket.c

@@ -3448,7 +3448,7 @@ EXPORT_SYMBOL(kernel_connect);
  *	@addr: address holder
  *
  * 	Fills the @addr pointer with the address which the socket is bound.
- *	Returns 0 or an error code.
+ *	Returns the length of the address in bytes or an error code.
  */
 
 int kernel_getsockname(struct socket *sock, struct sockaddr *addr)
@@ -3463,7 +3463,7 @@ EXPORT_SYMBOL(kernel_getsockname);
  *	@addr: address holder
  *
  * 	Fills the @addr pointer with the address which the socket is connected.
- *	Returns 0 or an error code.
+ *	Returns the length of the address in bytes or an error code.
  */
 
 int kernel_getpeername(struct socket *sock, struct sockaddr *addr)