Security: The fl_print_format_convert() is missing the check on the pointer and updat...

Security: The fl_print_format_convert() is missing the check on the pointer and update the related documentation comments.

The documentation comments have the status return values in the wrong spot.
Relocate them to below the variable.

This caused me to notice that this function is missing the standard NULL check on a pointer parameter.
The 0.7 versions make this parameter optional.
Do the same thing as the 0.7 versions and make this optional.