build error in http_get sample

[andrewboie]

  CC      subsys/net/lib/sockets/sockets.o
/projects/zephyr2/subsys/net/lib/sockets/sockets.c: In function ‘zsock_sendto’:
/projects/zephyr2/subsys/net/lib/sockets/sockets.c:277:11: error: ‘err’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
   errno = -err;
           ^~~~
cc1: all warnings being treated as errors
make[7]: *** [/projects/zephyr2/scripts/Makefile.build:183: subsys/net/lib/sockets/sockets.o] Error 1
  CC      subsys/net/lib/sockets/getaddrinfo.o
make[7]: Target '__build' not remade because of errors.
make[6]: *** [/projects/zephyr2/scripts/Makefile.build:357: subsys/net/lib/sockets] Error 2
make[6]: Target '__build' not remade because of errors.
make[5]: *** [/projects/zephyr2/scripts/Makefile.build:357: subsys/net/lib] Error 2

This is when building for qemu_x86.
Not sure why CI hasn't caught this.

[andrewboie]

@pfalcon feel free to reassign as appropriate

[nashif]

@askawu introduced by 9ec6077

[pfalcon]

I'm on it.