Asbjørn Sloth Tønnesen [off-list ref] writes:

Refactor the generation of local variables needed when building
requests, by moving the logic into the Type classes, and use the
same helper in all places where .attr_put() is called.

If any attributes requests identical local_vars, then they will
be deduplicated, attributes are assumed to only use their local
variables transiently.

This patch fixes the build errors below:
$ make -C tools/net/ynl/generated/
[...]
-e      GEN wireguard-user.c
-e      GEN wireguard-user.h
-e      CC wireguard-user.o
wireguard-user.c: In function ‘wireguard_get_device_dump’:
wireguard-user.c:480:9: error: ‘array’ undeclared (first use in func)
  480 |         array = ynl_attr_nest_start(nlh, WGDEVICE_A_PEERS);
      |         ^~~~~
wireguard-user.c:480:9: note: each undeclared identifier is reported
                        only once for each function it appears in
wireguard-user.c:481:14: error: ‘i’ undeclared (first use in func)
  481 |         for (i = 0; i < req->_count.peers; i++)
      |              ^
wireguard-user.c: In function ‘wireguard_set_device’:
wireguard-user.c:533:9: error: ‘array’ undeclared (first use in func)
  533 |         array = ynl_attr_nest_start(nlh, WGDEVICE_A_PEERS);
      |         ^~~~~
make: *** [Makefile:52: wireguard-user.o] Error 1
make: Leaving directory '/usr/src/linux/tools/net/ynl/generated'

Signed-off-by: Asbjørn Sloth Tønnesen <redacted>

Reviewed-by: Donald Hunter <donald.hunter@gmail.com>