Fix cppcheck complaint:
[cmd/efi.c:173]: (style) Clarify calculation precedence for '&' and '?'.

Fixes: f1a0bafb ("efi: Add a command to display the memory map")
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>