Use glib memory allocation and free functions

qemu_malloc/qemu_free no longer exist after this commit.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/dma-helpers.c b/dma-helpers.c
index ba7f897..4610ea0 100644
--- a/dma-helpers.c
+++ b/dma-helpers.c
@@ -12,7 +12,7 @@
 
 void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint)
 {
-    qsg->sg = qemu_malloc(alloc_hint * sizeof(ScatterGatherEntry));
+    qsg->sg = g_malloc(alloc_hint * sizeof(ScatterGatherEntry));
     qsg->nsg = 0;
     qsg->nalloc = alloc_hint;
     qsg->size = 0;
@@ -23,7 +23,7 @@
 {
     if (qsg->nsg == qsg->nalloc) {
         qsg->nalloc = 2 * qsg->nalloc + 1;
-        qsg->sg = qemu_realloc(qsg->sg, qsg->nalloc * sizeof(ScatterGatherEntry));
+        qsg->sg = g_realloc(qsg->sg, qsg->nalloc * sizeof(ScatterGatherEntry));
     }
     qsg->sg[qsg->nsg].base = base;
     qsg->sg[qsg->nsg].len = len;
@@ -33,7 +33,7 @@
 
 void qemu_sglist_destroy(QEMUSGList *qsg)
 {
-    qemu_free(qsg->sg);
+    g_free(qsg->sg);
 }
 
 typedef struct {