Apply a warning fix from lukem@NetBSD circa 1997 (more '()'), and
authorkrw <krw@openbsd.org>
Wed, 3 Aug 2016 23:37:25 +0000 (23:37 +0000)
committerkrw <krw@openbsd.org>
Wed, 3 Aug 2016 23:37:25 +0000 (23:37 +0000)
commit923d97b9105dd055e26ee4ee3b9a23d8df600741
tree561d002cfa9b65ebe9ac07f81c26b214e95d6e8e
parent7f0e3e8df1a47581ec20d3554c6edcd010d4766d
Apply a warning fix from lukem@NetBSD circa 1997 (more '()'), and
one from he@NetBSD circa 1998 (more '{}').

Makes gcc happier.
usr.sbin/mtrace/mtrace.c