Use %d instead of %u for error number.  This way we see ERESTART as -1
not 4294967295 when doing DTrace.

MFC after:	2 weeks


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275530 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f