Alias sys_getpeername to sys_getsockname

Since parsers for getpeername and getsockname syscalls are identical,
replace sys_getpeername with an alias to sys_getsockname.

* linux/dummy.h (sys_getpeername): Alias to sys_getsockname.
* linux/syscall.h (sys_getpeername): Remove.
* net.c (sys_getpeername): Remove.
3 files changed