[libxml2] xmlmemory: handle realloc properly

[Daniel Veillard <veillard src gnome org>]

commit 7446445dec0e46a5af821e57fa5ee04405666efd
Author: Yegor Yefremov <yegorslists googlemail com>
Date:   Fri Oct 10 12:23:09 2014 +0200

    xmlmemory: handle realloc properly
    
    If realloc fails, free original pointer.
    
    Signed-off-by: Yegor Yefremov <yegorslists googlemail com>

 xmlmemory.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/xmlmemory.c b/xmlmemory.c
index 05084e3..a3dc737 100644
--- a/xmlmemory.c
+++ b/xmlmemory.c
@@ -313,7 +313,7 @@ xmlMemMalloc(size_t size)
 void *
 xmlReallocLoc(void *ptr,size_t size, const char * file, int line)
 {
-    MEMHDR *p;
+    MEMHDR *p, *tmp;
     unsigned long number;
 #ifdef DEBUG_MEMORY
     size_t oldsize;
@@ -344,10 +344,12 @@ xmlReallocLoc(void *ptr,size_t size, const char * file, int line)
 #endif
     xmlMutexUnlock(xmlMemMutex);
 
-    p = (MEMHDR *) realloc(p,RESERVE_SIZE+size);
-    if (!p) {
+    tmp = (MEMHDR *) realloc(p,RESERVE_SIZE+size);
+    if (!tmp) {
+        free(p);
         goto error;
     }
+    p = tmp;
     if (xmlMemTraceBlockAt == ptr) {
        xmlGenericError(xmlGenericErrorContext,
                        "%p : Realloced(%lu -> %lu) Ok\n",