[libxml2] Make xmllint return an error if arguments are missing

[Nick Wellnhofer <nwellnhof src gnome org>]

commit eab86522163ec52602a020f62baa9f6cf87ec870
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Mon Jan 31 14:45:09 2022 +0100

    Make xmllint return an error if arguments are missing
    
    Before, xmllint would only return an error code if the argument
    list was completely empty.
    
    Fixes #285.

 xmllint.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/xmllint.c b/xmllint.c
index 2c7b9d04..4ad80a0f 100644
--- a/xmllint.c
+++ b/xmllint.c
@@ -3134,7 +3134,7 @@ main(int argc, char **argv) {
 
     if (argc <= 1) {
        usage(stderr, argv[0]);
-       return(1);
+       return(XMLLINT_ERR_UNCLASS);
     }
 
     /* xmlMemSetup must be called before initializing the parser. */
@@ -3504,7 +3504,7 @@ main(int argc, char **argv) {
        } else {
            fprintf(stderr, "Unknown option %s\n", argv[i]);
            usage(stderr, argv[0]);
-           return(1);
+           return(XMLLINT_ERR_UNCLASS);
        }
     }
 
@@ -3787,6 +3787,7 @@ main(int argc, char **argv) {
     }
     if ((files == 0) && (!generate) && (version == 0)) {
        usage(stderr, argv[0]);
+        progresult = XMLLINT_ERR_UNCLASS;
     }
 #ifdef LIBXML_SCHEMATRON_ENABLED
     if (wxschematron != NULL)