MFC r311688:

MFC r311688:

Fix logic error in gvinum's gv_set_sd_state()

With clang 4.0.0, I'm getting the following warnings:

    sys/geom/vinum/geom_vinum_state.c:186:7: error: logical not is only
    applied to the left hand side of this bitwise operator
    [-Werror,-Wlogical-not-parentheses]
                    if (!flags & GV_SETSTATE_FORCE)
                        ^      ~

The logical not operator should obiously be called after masking.

Reviewed by:	mav, pfg
Differential Revision:	https://reviews.freebsd.org/D9093

git-svn-id: svn://svn.freebsd.org/base/stable/9@311939 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f