binder: Modify comments

The function name should is binder_alloc_new_buf()

Signed-off-by: YangHui <yanghui.def@gmail.com>
Reviewed-by: Martijn Coenen <maco@android.com>
Link: https://lore.kernel.org/r/1597714444-3614-1-git-send-email-yanghui.def@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>