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/bitmap.h b/bitmap.h
index efd5d3a..08755eb 100644
--- a/bitmap.h
+++ b/bitmap.h
@@ -91,7 +91,7 @@
 static inline unsigned long *bitmap_new(int nbits)
 {
     int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
-    return qemu_mallocz(len);
+    return g_malloc0(len);
 }
 
 static inline void bitmap_zero(unsigned long *dst, int nbits)