stack overflow found by honggfuzz

```
<0x00000000004b4bb7> [valid():28 at /out/libxml2/xml]
 <0x000000000041dd95> [_ZN6__asan9Allocator8AllocateEmmPN11__sanitizer18BufferedStackTraceENS_9AllocTypeEb():509 at /out/libxml2/xml]
 <0x000000000041d7b4> [_ZN6__asan11asan_mallocEmPN11__sanitizer18BufferedStackTraceE():875 at /out/libxml2/xml]
 <0x00000000004947ac> [malloc():147 at /out/libxml2/xml]
 <0x000000000062eacd> [xmlStrndup():46 at /out/libxml2/xml]
 <0x000000000054d1da> [xmlStaticCopyNode():4259 at /out/libxml2/xml]
 <0x000000000054d97e> [xmlStaticCopyNodeList():4367 at /out/libxml2/xml]
 <0x000000000054c521> [xmlCopyPropInternal():4095 at /out/libxml2/xml]
 <0x000000000054c99b> [xmlCopyPropList():4156 at /out/libxml2/xml]
 <0x000000000054d327> [xmlStaticCopyNode():4315 at /out/libxml2/xml]
 <0x000000000054d97e> [xmlStaticCopyNodeList():4367 at /out/libxml2/xml]
 <0x000000000054d406> [xmlStaticCopyNode():4330 at /out/libxml2/xml]
 <0x000000000054d97e> [xmlStaticCopyNodeList():4367 at /out/libxml2/xml]
 <0x000000000054d406> [xmlStaticCopyNode():4330 at /out/libxml2/xml]
 <0x000000000054d97e> [xmlStaticCopyNodeList():4367 at /out/libxml2/xml]
 <0x000000000054d406> [xmlStaticCopyNode():4330 at /out/libxml2/xml]
 <0x000000000054d97e> [xmlStaticCopyNodeList():4367 at /out/libxml2/xml]
 <0x000000000054d406> [xmlStaticCopyNode():4330 at /out/libxml2/xml]
 <0x000000000054d97e> [xmlStaticCopyNodeList():4367 at /out/libxml2/xml]
 <0x000000000054d406> [xmlStaticCopyNode():4330 at /out/libxml2/xml]
 <0x000000000054d97e> [xmlStaticCopyNodeList():4367 at /out/libxml2/xml]
.....
```

upstream fix: 
https://gitlab.gnome.org/GNOME/libxml2/commit/79301d3d5e553d46fc3201f48dcec3a93068c5a2
https://gitlab.gnome.org/GNOME/libxml2/-/commit/31c6ce3b63f8a494ad9e31ca65187a73d8ad3508

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