misc: Fix new typos in comments and strings

All these typos were found by codespell.

sould -> should
emperical -> empirical
intialization -> initialization
successfuly -> successfully
gaurantee -> guarantee

Fix also another error (before before) in the same context.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
index 3fa72a9..337cfa5 100644
--- a/hw/virtio/virtio-balloon.c
+++ b/hw/virtio/virtio-balloon.c
@@ -53,8 +53,8 @@
 /*
  * reset_stats - Mark all items in the stats array as unset
  *
- * This function needs to be called at device intialization and before
- * before updating to a set of newly-generated stats.  This will ensure that no
+ * This function needs to be called at device initialization and before
+ * updating to a set of newly-generated stats.  This will ensure that no
  * stale values stick around in case the guest reports a subset of the supported
  * statistics.
  */