gfs2: Add GL_SKIP holder flag to dump_holder

Somehow, the GL_SKIP flag was missed when dumping glock holders.
This patch adds it to function hflags2str. I added it at the end because
I wanted Holder and Skip flags together to read "Hs" rather than "sH"
to avoid confusion with "Shared" ("SH") holder state.
Signed-off-by: NBob Peterson <rpeterso@redhat.com>
Signed-off-by: NAndreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/glock.c

@@ -2238,6 +2238,8 @@ static const char *hflags2str(char *buf, u16 flags, unsigned long iflags)
 		*p++ = 'W';
 	if (test_bit(HIF_MAY_DEMOTE, &iflags))
 		*p++ = 'D';
+	if (flags & GL_SKIP)
+		*p++ = 's';
 	*p = 0;
 	return buf;
 }