[riot-notifications] [RIOT-OS/RIOT] drivers/sds011: Fix error return value on SAUL driver (#10913)

Leandro Lanzieri notifications at github.com
Thu Jan 31 15:45:39 CET 2019

### Contribution description
The `read` function of a SAUL driver should return the number of values written into to result data structure [1-3], `-ENOTSUP` if the device does not support this operation or `-ECANCELED` on other errors.

This PR fixes the return value of the read function of the sds011 SAUL driver to `-ECANCELED` instead of `ECANCELED`.

### Testing procedure
Run the default SAUL application (`tests/saul`).

### Issues/PRs references

Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * drivers/sds011: Fix SAUL read error return

-- File Changes --

    M drivers/sds011/sds011_saul.c (2)

-- Patch Links --


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