[libxml2] Fix parsing of xmllint --maxmem option

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 247cfa27ccaa50421b4e127dd6ea13aa5fe59549
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Tue Feb 1 16:21:10 2022 +0100

    Fix parsing of xmllint --maxmem option
    
    Fixes #195.

 xmllint.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/xmllint.c b/xmllint.c
index ae70a68d..24768bc9 100644
--- a/xmllint.c
+++ b/xmllint.c
@@ -3189,14 +3189,13 @@ main(int argc, char **argv) {
        if ((!strcmp(argv[i], "-maxmem")) ||
            (!strcmp(argv[i], "--maxmem"))) {
             i++;
-            if (sscanf(argv[i], "%d", &maxmem) == 1) {
-                xmlMemSetup(myFreeFunc, myMallocFunc, myReallocFunc,
-                            myStrdupFunc);
-            } else {
+            if ((i >= argc) || (sscanf(argv[i], "%d", &maxmem) != 1)) {
                 maxmem = 0;
             }
         }
     }
+    if (maxmem != 0)
+        xmlMemSetup(myFreeFunc, myMallocFunc, myReallocFunc, myStrdupFunc);
 
     LIBXML_TEST_VERSION