test-boot-timestamp: Handle ERANGE error

Timestampfs from sysfs files can be zero in which case ERANGE will
be returned so let's make sure we catch that.

src/test/test-boot-timestamps.c

@@ -16,7 +16,7 @@ static int test_acpi_fpdt(void) {
 
         r = acpi_get_boot_usec(&loader_start, &loader_exit);
         if (r < 0) {
-                bool ok = IN_SET(r, -ENOENT, -ENODATA) || ERRNO_IS_PRIVILEGE(r);
+                bool ok = IN_SET(r, -ENOENT, -ENODATA, -ERANGE) || ERRNO_IS_PRIVILEGE(r);
 
                 log_full_errno(ok ? LOG_DEBUG : LOG_ERR, r, "Failed to read ACPI FPDT: %m");
                 return ok ? 0 : r;