hash: Fix possible startup crash with old libxslt versions

Call xmlInitParser in xmlHashCreate to make it work if the library
wasn't initialized yet.

Otherwise, exsltRegisterAll from libxslt 1.1.24 or older might cause
a crash.

See #534.

1 files changed, 2 insertions, 0 deletions

diff --git a/hash.c b/hash.c
index 479ff467..cbcc4293 100644
--- a/hash.c
+++ b/hash.c
@@ -180,6 +180,8 @@ xmlHashTablePtr
 xmlHashCreate(int size) {
     xmlHashTablePtr table;
 
+    xmlInitParser();
+
     if (size <= 0)
         size = 256;