* gnu/packages/patches/grub-check-error-efibootmgr.patch: Add hunk to correct uninitialized variable.
* gnu/packages/patches/grub-check-error-efibootmgr.patch: New file. * gnu/local.mk (dist_patch_DATA): Register it. * gnu/packages/bootloaders.scm (grub)[source](patches): New field.