Commitf8fa4222c9added extra logic to account for the size of the initrds before allocating the required memory pages, but missed checking if the initrds were empty before allocating memory. Extend the initrd options only when the initrd is valid, and add extra check for validating that there is at least one valid initrd file before allocating memory, fixing the following crash when booting with empty initrd files: src/boot/log.c:30@efi_assert: systemd-boot: Assertion 'BS->AllocatePages(type, memory_type, n_pages, &addr) == EFI_SUCCESS' failed at /usr/src/debug/systemd-boot/257.8/src/boot/util.h:95@xmalloc_pages, halting. Fixes:f8fa4222c9("boot: Make initrd_prepare() semantically equivalent to combine_initrds()") (cherry picked from commita40f4ba1a8)
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