Fix misleading indentation (#4629)
* Adjust indentation of statement, without this fix GCC 7.5 errors
out with:
"this ‘if’ clause does not guard this statement, but the
latter is misleadingly indented as if it were guarded by the ‘if’"
* Add braces around the if-statement for improved clarity.
Co-authored-by: Alberto Magni <alberto.magni@microsoft.com>
