maint: drop spurious semicolons

maint: drop spurious semicolons

I noticed a line 'int nparams = 0;;' in remote_dispatch.h, and
tracked down where it was generated.  While at it, I found a
couple of other double semicolons.  Additionally, I noticed that
commit df0b57a95 left a stale reference to the file name
remote_dispatch_bodies.h.

* src/conf/numatune_conf.c (virDomainNumatuneNodeParseXML): Drop
empty statement.
* tests/virdbustest.c (testMessageStruct, testMessageSimple):
Likewise.
* src/rpc/gendispatch.pl (remote_dispatch_bodies.h): Likewise, and
update stale comments.

Signed-off-by: Eric Blake <eblake@redhat.com>