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readtif, writetif: simplify rounding

--- a/sys/src/cmd/jpg/readtif.c

+++ b/sys/src/cmd/jpg/readtif.c

@@ -1574,7 +1574,6 @@

 static int

 checkfields(Tif *t)

 {

-	double a, b;

 	ulong n, size;

 	if(t->dx == 0) {

@@ -1647,9 +1646,7 @@

 		werrstr("rows per strip");

 		return -1;

 	}

-	a = (double)t->dy;

-	b = (double)t->rows;

-	n = (ulong)floor((a+b-1)/b);

+	n = (t->dy + t->rows - 1) / t->rows;

 	if(t->strips == nil || t->nstrips != n) {

 		werrstr("strip offsets");

 		return -1;

--- a/sys/src/cmd/jpg/writetif.c

+++ b/sys/src/cmd/jpg/writetif.c

@@ -1041,19 +1041,14 @@

 {

 	int rgb;

 	ulong i, count, n;

-	double a, b;

 	count = t->ndata < 0x2000? t->ndata: 0x2000;

-	t->rows = count / t->bpl;

-	if(count%t->bpl != 0)

-		t->rows++;

+	t->rows = (count + t->bpl - 1) / t->bpl;

 	if(t->comp == Tt4enc && t->opt) {

 		if((n = t->rows%Kpar) != 0)

 			t->rows += Kpar - n;

 	}

-	a = (double)t->dy;

-	b = (double)t->rows;

-	t->nstrips = (ulong)floor((a+b-1)/b);

+	t->nstrips = (t->dy + t->rows - 1) / t->rows;

 	t->strips = malloc(t->nstrips*sizeof *t->strips);

 	if(t->strips == nil)

 		return memerr;

-- 

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