mkcompose: fix crash if no target for hardlink

Signed-off-by: Giuseppe Scrivano <[email protected]>

Author: giuseppe

tests/fuzzing/data/SIGSEGV.PC.432623.STACK.1a9c9e1981.CODE.1.ADDR.0.INSTR.movsbl_(%rax),%eax.fuzz

@@ -368,6 +368,8 @@ static char *tree_resolve_hardlinks(dump_info *info)
 	hardlink_fixup *fixup = info->hardlink_fixups;
 	while (fixup != NULL) {
 		hardlink_fixup *next = fixup->next;
+		if (fixup->target_path == NULL)
+			return make_error("No target path for the hardlink");
 		struct lcfs_node_s *target =
 			lookup_path(info->root, fixup->target_path);
 		if (target == NULL)