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/ui/vnc-enc-tight.c b/ui/vnc-enc-tight.c
index 5c02803..5d492ab 100644
--- a/ui/vnc-enc-tight.c
+++ b/ui/vnc-enc-tight.c
@@ -1293,13 +1293,13 @@
 
     jpeg_start_compress(&cinfo, true);
 
-    buf = qemu_malloc(w * 3);
+    buf = g_malloc(w * 3);
     row[0] = buf;
     for (dy = 0; dy < h; dy++) {
         rgb_prepare_row(vs, buf, x, y + dy, w);
         jpeg_write_scanlines(&cinfo, row, 1);
     }
-    qemu_free(buf);
+    g_free(buf);
 
     jpeg_finish_compress(&cinfo);
     jpeg_destroy_compress(&cinfo);
@@ -1363,12 +1363,12 @@
 
 static void *vnc_png_malloc(png_structp png_ptr, png_size_t size)
 {
-    return qemu_malloc(size);
+    return g_malloc(size);
 }
 
 static void vnc_png_free(png_structp png_ptr, png_voidp ptr)
 {
-    qemu_free(ptr);
+    g_free(ptr);
 }
 
 static int send_png_rect(VncState *vs, int x, int y, int w, int h,
@@ -1432,7 +1432,7 @@
     png_write_info(png_ptr, info_ptr);
 
     buffer_reserve(&vs->tight.png, 2048);
-    buf = qemu_malloc(w * 3);
+    buf = g_malloc(w * 3);
     for (dy = 0; dy < h; dy++)
     {
         if (color_type == PNG_COLOR_TYPE_PALETTE) {
@@ -1442,7 +1442,7 @@
         }
         png_write_row(png_ptr, buf);
     }
-    qemu_free(buf);
+    g_free(buf);
 
     png_write_end(png_ptr, NULL);