[PATCH] Fix minor memory leak

[Nolan <nolan@sigbus.net>]

Fix a memory leak.  No big deal, since it happens only a bounded # of
times at startup (as far as I can tell) but it makes valgrind complain.

I sent this here since qemu doesn't have the code in question (it
allocates buf on the stack, and thus guess_disk_lchs() usually won't
work with O_DIRECT).

Signed-off-by: Nolan Leake nolan <at> sigbus.net

diff --git a/qemu/block.c b/qemu/block.c
index 7a469ed..3cdebcd 100644
--- a/qemu/block.c
+++ b/qemu/block.c
@@ -771,8 +771,10 @@ static int guess_disk_lchs(BlockDriverState *bs,
     bdrv_get_geometry(bs, &nb_sectors);
 
     ret = bdrv_read(bs, 0, buf, 1);
-    if (ret < 0)
+    if (ret < 0) {
+        qemu_free(buf);
         return -1;
+    }
     /* test msdos magic */
     if (buf[510] != 0x55 || buf[511] != 0xaa) {
         qemu_free(buf);