controller: Fix readability-braces-around-statements

```
/home/andrew/src/openbmc/phosphor-led-sysfs/build/../controller.cpp:75:36: error: statement should be inside braces [readability-braces-around-statements,-warnings-as-errors]
    if (!ledDescr.function.empty())
                                   ^
                                    {
/home/andrew/src/openbmc/phosphor-led-sysfs/build/../controller.cpp:77:33: error: statement should be inside braces [readability-braces-around-statements,-warnings-as-errors]
    if (!ledDescr.color.empty())
                                ^
                                 {
```

Change-Id: I2f1a487638786885ff4ebd9aba26e22c1b943fe1
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
1 file changed