[riot-notifications] [RIOT-OS/RIOT] net/gcoap: fix sock send return type (#8580)

Ken Bannister notifications at github.com
Fri Feb 16 19:37:25 CET 2018

### Contribution description
During the review for #7337, I found that gcoap assumed the return type for gcoap_udp_send() was of type `size_t`, but really it is of type `ssize_t`. This PR fixes that error. I also added a debug statement to show the error code from an invocation of gcoap_udp_send().

### Issues/PRs references
[Discussion](https://github.com/RIOT-OS/RIOT/pull/7337#issuecomment-357868126) in the earlier PR.
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-- Commit Summary --

  * net/gcoap: fix sock send return type

-- File Changes --

    M sys/net/application_layer/gcoap/gcoap.c (16)

-- Patch Links --


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