strange instruction in IDA when debugging malware

Question

What does mov edi, ds:RegCloseKey actually do ?

Does it call RegCloseKey and the registry is "closed"?

The whole function looks like

call  ds:RegOpenKeyEXW    
test  eax,eax    
jnz   loc_12345    
push  push 300h    
lea   eax, [ebp-0C64h]
push  eax 
push  esi 
push  dword ptr [rbp-0C64h]
call  ds:RegEnumKeyW
mov   edi ds:RegCloseKey

Answer 1

No, it means it's storing the address for later use, what comes after that segment? Something in the line of "CALL EDI" I'm guessing.

Answer 2

It is certainly preparing to call it, we can speculate (why else reference it?).

RegCloseKey is simply used to close an open handle to the registry. It doesn't 'shut down' the registry, as your question seemed to imply (to me anyway). It is just another handle close function, but applies to registry handles. Those that come from any Registry function - RegOpenKey, RegCreateKeyEx, etc..