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Correctly format zero floats.

--- a/lib/std/fltfmt.myr

+++ b/lib/std/fltfmt.myr

@@ -41,7 +41,7 @@

 p: precision

 f: mantissa

-flting value: x = f^(e - p)

+floating value: x = f^(e - p)

 */

 const dragon4 = {sb, isneg, f, e, p, mode, cutoff

 	var r, s, t, u, v, y

@@ -49,16 +49,16 @@

 	var mm, mp	/* margins above and below */

 	var roundup

 	var low, high

-	var k, n

+	var k

 	var a, i

 	/* if we have zero for the mantissa, we can return early */

-	n = 0

 	if isneg

 		sbputs(sb, "-")

 	;;

 	if f == 0

 		sbputs(sb, "0.0")

+		-> void

 	;;

 	/* initialize */

@@ -223,7 +223,6 @@

 		| `After:	format(sb, udig + 1, k)

 		;;

 	;;

-	-> n

 }

 const lowdig = {u

--- a/lib/std/test/fmt.myr

+++ b/lib/std/test/fmt.myr

@@ -62,6 +62,7 @@

 	check("123", "{}", 123)

 	check("7b", "{x}", 123)

 	check("0x7b", "0x{x}", 123)

+	check("0.0", "{}", 0.0)

 	check("0.3", "{}", 0.3)

 	check("666.91972", "{}", 666.91972)

 	check("1.0001", "{}", 1.0001)