Clean up header guards that don't match their file name

Header guard symbols should match their file name to make guard
collisions less likely.

Cleaned up with scripts/clean-header-guards.pl, followed by some
renaming of new guard symbols picked by the script to better ones.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20190315145123.28030-6-armbru@redhat.com>
[Rebase to master: update include/hw/net/ne2000-isa.h]
diff --git a/fsdev/qemu-fsdev-throttle.h b/fsdev/qemu-fsdev-throttle.h
index 4e83bda..7d6211d 100644
--- a/fsdev/qemu-fsdev-throttle.h
+++ b/fsdev/qemu-fsdev-throttle.h
@@ -12,8 +12,8 @@
  *
  */
 
-#ifndef _FSDEV_THROTTLE_H
-#define _FSDEV_THROTTLE_H
+#ifndef QEMU_FSDEV_THROTTLE_H
+#define QEMU_FSDEV_THROTTLE_H
 
 #include "block/aio.h"
 #include "qemu/main-loop.h"
@@ -35,4 +35,5 @@
                                             struct iovec *, int);
 
 void fsdev_throttle_cleanup(FsThrottle *);
-#endif /* _FSDEV_THROTTLE_H */
+
+#endif /* QEMU_FSDEV_THROTTLE_H */