Fixed two small bugs: misnaming of check_download_file() at import, and then calling that file with util. as prefix.
Fixed two small bugs: misnaming of check_download_file() at import,
and then calling that file with util. as prefix.

dpshelio/sunpy,Alex-Ian-Hamilton/sunpy,dpshelio/sunpy,Alex-Ian-Hamilton/sunpy,dpshelio/sunpy,Alex-Ian-Hamilton/sunpy