[riot-notifications] [RIOT-OS/RIOT] esp_now: fix unused variable warning (#12263)

benpicco notifications at github.com
Tue Sep 17 19:08:35 CEST 2019

### Contribution description

`esp_now_pkt_hdr_t *hdr` is only used if` gnrc_sixlowpan` is used, so move it into the according `#ifdef`

### Testing procedure
- Add `USEMODULE += esp_now` to both `examples/default` and `examples/gnrc_networking`
- Compile both for e.g. `BOARD=esp8266-esp-12x`
- no warnings / errors should be printed.

### Issues/PRs references
fixes #12257

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-- Commit Summary --

  * esp_now: fix unused variable warning

-- File Changes --

    M cpu/esp_common/esp-now/esp_now_gnrc.c (3)

-- Patch Links --


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