ide-floppy: mv idefloppy_{should_,}report_error

In addition to shortening the function name, move the printk-call into the
function thereby saving some code lines. Also, make the function out_of_line
since it is not on a performance critical path. Finally, rename the reworked
function to ide_floppy..().

Bart:
- minor CodingStyle fixup

Signed-off-by: Borislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>