Reintialize registry value name string and buffer size for each key i…

…teration. Fixes euantorano#37 (euantorano#38)

src/serial/private/utils/windows_registry.nim

@@ -79,10 +79,10 @@ iterator enumKeyValues*(path: string, handle: HKEY): tuple[key:string, value:str
  var newHandle: HKEY
  call regOpenKeyEx(handle, hh, 0, KEY_READ or KEY_WOW64_64KEY, newHandle)
  call regQueryInfoKey(newHandle, nil, nil, nil, nil, nil, nil, addr numValues, nil, nil, nil, nil)
- var regNameSize = 16383'i32
- var regName = newWideCString("", regNameSize)
  for i in 0 ..< numValues:
  var regValueSize = 0'i32
+ var regNameSize = 16383'i32
+ var regName = newWideCString("", regNameSize)
  call regEnumValue(newHandle, int32(i), regName, addr regNameSize, nil, nil, nil, addr regValueSize)
  var regValue = newWideCString("", regValueSize)
  regNameSize += 2 # reallocate for null wchar.
@@ -129,3 +129,4 @@ proc setUnicodeValue*(path, key, val: string; handle: HKEY) =
  let kk = newWideCString key
  let vv = newWideCString val
  call regSetValue(handle, hh, kk, REG_SZ, vv, (vv.len.int32+1)*2)
+