fixed an out of bound error #118052 , the good part if that base64 code

* xmlreader.c: fixed an out of bound error #118052 , the good
  part if that base64 code was not in use yet ...
Daniel
diff --git a/xmlreader.c b/xmlreader.c
index 031e054..59dc6bb 100644
--- a/xmlreader.c
+++ b/xmlreader.c
@@ -2879,7 +2879,7 @@
     unsigned long inmax;		/* size of in[] */
     unsigned long outmax;		/* size of out[] */
     unsigned char cur;			/* the current value read from in[] */
-    unsigned char intmp[3], outtmp[4];	/* temporary buffers for the convert */
+    unsigned char intmp[4], outtmp[4];	/* temporary buffers for the convert */
     int nbintmp;			/* number of byte in intmp[] */
     int is_ignore;			/* cur should be ignored */
     int is_end = 0;			/* the end of the base64 was found */