[riot-notifications] [RIOT-OS/RIOT] sam0_common: check ADC_NUMOF on adc_init() (#10936)

Martine Lenders notifications at github.com
Mon Feb 4 09:32:58 CET 2019

The RIOT community cares a lot about code quality.
Therefore, before describing what your contribution is about, we would like
you to make sure that your modifications are compliant with the RIOT
coding conventions, see https://github.com/RIOT-OS/RIOT/wiki/Coding-conventions.

### Contribution description
While working on a [private project](https://github.com/miri64/RIOT_playground/tree/master/wand), I noticed that `adc_init` for `sam0_common` doesn't check the correctness of the `line` parameter. The doc states it [should return -1](http://doc.riot-os.org/group__drivers__periph__adc.html#ga259a7b0176a8a6f5a5e61aabce3574f0) on error, so I added the missing check and return.
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- describe which part(s) of RIOT is (are) involved
- if it's a bug fix, describe the bug that it solves and how it is solved
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### Testing procedure
Try initializing ADC on a `sam0` based board (e.g. `samr21-xpro) for a line that is not defined (e.g. `ADC_LINE(9)`). Without this PR the board will crash. With it, the function will just return -1.
Details steps to test your contribution:
- which test/example to compile for which board and is there a 'test' command
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### Issues/PRs references
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-- Commit Summary --

  * sam0_common: check ADC_NUMOF on adc_init()

-- File Changes --

    M cpu/sam0_common/periph/adc.c (4)

-- Patch Links --


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