buffer_putsflush - write ASCIIZ string to buffer and flush

       buffer_putsflush  is  like buffer_putflush with len determined as the number of bytes before the first \0
       in x.

       buffer_putsflush - write ASCIIZ string to buffer and flush

buffer_put(3), buffer_flush(3), buffer(3)

                                                                                             buffer_putsflush(3)

#include<libowfat/buffer.h>

       int buffer_putsflush(buffer* b,const char* x);