[libxml2] Drop not needed checks

[Daniel Veillard <veillard src gnome org>]

commit 0146179120d4f1162f0400a0131bea2e5d600155
Author: Denis Pauk <pauk denis gmail com>
Date:   Tue Aug 6 09:55:55 2013 +0300

    Drop not needed checks
    
    https://bugzilla.gnome.org/show_bug.cgi?id=704075

 valid.c |   19 ++++++++++---------
 1 files changed, 10 insertions(+), 9 deletions(-)
---
diff --git a/valid.c b/valid.c
index e0832e7..d3c706b 100644
--- a/valid.c
+++ b/valid.c
@@ -2740,23 +2740,24 @@ xmlRemoveID(xmlDocPtr doc, xmlAttrPtr attr) {
 
     if (doc == NULL) return(-1);
     if (attr == NULL) return(-1);
+
     table = (xmlIDTablePtr) doc->ids;
     if (table == NULL)
         return(-1);
 
-    if (attr == NULL)
-       return(-1);
     ID = xmlNodeListGetString(doc, attr->children, 1);
     if (ID == NULL)
-       return(-1);
+        return(-1);
+
     id = xmlHashLookup(table, ID);
     if (id == NULL || id->attr != attr) {
-       xmlFree(ID);
-       return(-1);
+        xmlFree(ID);
+        return(-1);
     }
+
     xmlHashRemoveEntry(table, ID, (xmlHashDeallocator) xmlFreeID);
     xmlFree(ID);
-       attr->atype = 0;
+    attr->atype = 0;
     return(0);
 }
 
@@ -3059,21 +3060,21 @@ xmlRemoveRef(xmlDocPtr doc, xmlAttrPtr attr) {
 
     if (doc == NULL) return(-1);
     if (attr == NULL) return(-1);
+
     table = (xmlRefTablePtr) doc->refs;
     if (table == NULL)
         return(-1);
 
-    if (attr == NULL)
-        return(-1);
     ID = xmlNodeListGetString(doc, attr->children, 1);
     if (ID == NULL)
         return(-1);
-    ref_list = xmlHashLookup(table, ID);
 
+    ref_list = xmlHashLookup(table, ID);
     if(ref_list == NULL) {
         xmlFree(ID);
         return (-1);
     }
+
     /* At this point, ref_list refers to a list of references which
      * have the same key as the supplied attr. Our list of references
      * is ordered by reference address and we don't have that information