libelf: relax ELF_PADDR_OFFSET && !VIRT_BASE check for PVH

Both values are unconditionally overridden (to 0) in the "hvm" (i.e.
PVH) case. There's therefore no reason to punish a PVH kernel for
setting the former but not the latter.

Fixes: 632cbaf124 ("libelf: improve PVH elfnote parsing")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Jason Andryuk <jandryuk@gmail.com>

xen/common/libelf/libelf-dominfo.c

@@ -419,7 +419,8 @@ static elf_errorstatus elf_xen_addr_calc_check(struct elf_binary *elf,
     uint64_t virt_offset;
 
     if ( (parms->elf_paddr_offset != UNSET_ADDR) &&
-         (parms->virt_base == UNSET_ADDR) )
+         (parms->virt_base == UNSET_ADDR) &&
+         !hvm )
     {
         elf_err(elf, "ERROR: ELF_PADDR_OFFSET set, VIRT_BASE unset\n");
         return -1;