efi_loader: fix 'efidebug bootorder'

* don't copy GUIDs for no reason
* shorten print format strings by using variable names
* don't use the run-time table to access exported functions
* check the result of malloc() (fixes Coverity CID 300331)

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
1 file changed