udev_rules_parse_file: do not ignore ENOENT when invoked by udevadm verify

Make sure the ENOENT exception reintroduced by commit
9db7081d83 is not applied when the parser
is invoked by udevadm verify.

src/udev/udev-rules.c

@@ -1437,7 +1437,7 @@ int udev_rules_parse_file(UdevRules *rules, const char *filename, bool extra_che
 
         f = fopen(filename, "re");
         if (!f) {
-                if (errno == ENOENT)
+                if (!extra_checks && errno == ENOENT)
                         return 0;
 
                 return log_warning_errno(errno, "Failed to open %s, ignoring: %m", filename);

test/units/testsuite-17.11.sh

@@ -97,6 +97,8 @@ assert_1 --resolve-names=now
 # Failed to parse rules file .: Is a directory
 cp "${workdir}/default_output_1_fail" "${exo}"
 assert_1 .
+# Failed to parse rules file ./nosuchfile: No such file or directory
+assert_1 ./nosuchfile
 # Failed to parse rules file .: Is a directory
 cat >"${exo}" <<EOF