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clock: remove unused variable

--- a/sys/src/cmd/clock.c

+++ b/sys/src/cmd/clock.c

@@ -23,10 +23,8 @@

 	static Rectangle r;

 	static Point c;

 	static int rad;

-	static Image *im;

 	int i;

 	int anghr, angmin;

-	static Tm tms;

 	static Tm ntms;

 	ntm = time(0);

@@ -37,7 +35,6 @@

 	anghr = 90-(ntms.hour*5 + ntms.min/12)*6;

 	angmin = 90-ntms.min*6;

 	tm = ntm;

-	tms = ntms;

 	r = screen->r;

 	c = divpt(addpt(r.min, r.max), 2);

 	rad = Dx(r) < Dy(r) ? Dx(r) : Dy(r);