A crash in msys-libxml2 xmlcatalog or zlib

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One guy experienced crashes in xmlcatalog.exe (from msys-libxml2).
Here's the backtrace he gave me (backtrace.log, attached).

After re-compiling libxml with debug info the crash was revealed to
happen at xmlIO.c:2525 with cptr being NULL.

Re-compiling msys-libxml without zlib support worked around this.

Make of this what you will.
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Starting program: C:\msys\bin\xmlcatalog.exe --noout --add delegateSystem http:/
/docbook.org/xml/ ./docbook-xml.xml c:/mingw32/etc/xml/catalog
[New Thread 3388.0xcdc]
[New Thread 3388.0x163c]
[New Thread 3388.0x11b4]
[New Thread 3388.0x15fc]

Program received signal SIGSEGV, Segmentation fault.
0x60885fe1 in strncmp () from C:\msys\bin\msys-1.0.dll
(gdb) bt
#0  0x60885fe1 in strncmp () from C:\msys\bin\msys-1.0.dll
#1  0x70e3d222 in __xmlParserInputBufferCreateFilename (
    URI=0xa012088 "c:/mingw32/etc/xml/catalog", enc=XML_CHAR_ENCODING_NONE)
    at /f/src/for-mingwmsys/msys-libxml2-2.7.6-1/libxml2-2.7.6/xmlIO.c:2525
#2  0x70e3d2a4 in xmlParserInputBufferCreateFilename (
    URI=0xa012088 "c:/mingw32/etc/xml/catalog", enc=XML_CHAR_ENCODING_NONE)
    at /f/src/for-mingwmsys/msys-libxml2-2.7.6-1/libxml2-2.7.6/xmlIO.c:2559
#3  0x70e85f90 in xmlParseCatalogFile (
    filename=0xa012088 "c:/mingw32/etc/xml/catalog")
    at /f/src/for-mingwmsys/msys-libxml2-2.7.6-1/libxml2-2.7.6/catalog.c:901
#4  0x70e86cc9 in xmlParseXMLCatalogFile (prefer=XML_CATA_PREFER_PUBLIC,
    filename=0xa012088 "c:/mingw32/etc/xml/catalog")
    at /f/src/for-mingwmsys/msys-libxml2-2.7.6-1/libxml2-2.7.6/catalog.c:1347
#5  0x70e87081 in xmlFetchXMLCatalogFile (catal=0xa012058)
    at /f/src/for-mingwmsys/msys-libxml2-2.7.6-1/libxml2-2.7.6/catalog.c:1452
#6  0x70e871a3 in xmlAddXMLCatalog (catal=0xa012058,
    type=0x28fe89 "delegateSystem", orig=0x28fe98 "http://docbook.org/xml/",
    replace=0x28feb0 "./docbook-xml.xml")
    at /f/src/for-mingwmsys/msys-libxml2-2.7.6-1/libxml2-2.7.6/catalog.c:1508
#7  0x70e89a9e in xmlACatalogAdd (catal=0xa012010,
    type=0x28fe89 "delegateSystem", orig=0x28fe98 "http://docbook.org/xml/",
    replace=0x28feb0 "./docbook-xml.xml")
    at /f/src/for-mingwmsys/msys-libxml2-2.7.6-1/libxml2-2.7.6/catalog.c:2966
#8  0x70e8a2da in xmlCatalogAdd (type=0x28fe89 "delegateSystem",
    orig=0x28fe98 "http://docbook.org/xml/",
    replace=0x28feb0 "./docbook-xml.xml")
    at /f/src/for-mingwmsys/msys-libxml2-2.7.6-1/libxml2-2.7.6/catalog.c:3433
#9  0x004024dc in main (argc=7, argv=0xa0116b8)
    at /f/src/for-mingwmsys/msys-libxml2-2.7.6-1/libxml2-2.7.6/xmlcatalog.c:527
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