tree eaf154c40bbc22e9e9f1ba882050eeecbe2cdc9d
parent 21cb052b1446bb006aa5e1f6fdfcc0bad678bb70
author Andrew Jeffery <andrew@codeconstruct.com.au> 1728041754 +0930
committer Andrew Jeffery <andrew@codeconstruct.com.au> 1728372619 +1030

utils: Avoid array-lookup in is_time_legal()

```
../src/utils.c: In function ‘is_time_legal’:
../src/utils.c:213:22: error: use of attacker-controlled value ‘month’ in array lookup without checking for negative [CWE-129] [-Werror=analyzer-tainted-array-index]
  213 |         unsigned int rday = days[month];
      |                      ^~~~
```

This isn't really the case, but GCC's analyzer currently thinks so, so
clean it up with a switch statement.

Change-Id: I60e0a6cb3ad275455fdc27de8042afe34c09ba60
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>