It IS a security risk. In an scenario where you maintain your HDD free of sensible information, there may be a situation where a clever attacker may get info from the hiberfil, however, most times this info is also available in your HDD, unless you're a very carefull person. Anything that is in your RAM when you hibernate your computer will go to hiberfil, so be carefull. There may be a private key, an ID cookie, whatever.
As a curiosity, in a security class at the university, we had to use a dump file from a linux machine (which is kinda the same than hiberfill) to search for usernames and passwords. It doesnt look like a normal text file, but binary files can be read with specific software.
There's nothing wrong about removing hiberfill, the only downside is that you wont be able to hibernate your computer.
On every Windows machine, you can disable hibernation with the command:
powercfg.exe /hibernate off
Or enable it with
powercfg.exe /hibernate on
Both need administrative privileges (run CMD as Admin and then paste the command)
By default, I disable hibernation on every computer I put my hands on.