math: s/MinFloat/SmallestNonzeroFloat/

R=r, gri
CC=golang-dev
https://golang.org/cl/3547042
diff --git a/src/pkg/math/all_test.go b/src/pkg/math/all_test.go
index 03d9fe8..6033d37 100644
--- a/src/pkg/math/all_test.go
+++ b/src/pkg/math/all_test.go
@@ -2263,9 +2263,9 @@
 
 var floatTests = []floatTest{
 	{float64(MaxFloat64), "MaxFloat64", "1.7976931348623157e+308"},
-	{float64(MinFloat64), "MinFloat64", "5e-324"},
+	{float64(SmallestNonzeroFloat64), "SmallestNonzeroFloat64", "5e-324"},
 	{float32(MaxFloat32), "MaxFloat32", "3.4028235e+38"},
-	{float32(MinFloat32), "MinFloat32", "1e-45"},
+	{float32(SmallestNonzeroFloat32), "SmallestNonzeroFloat32", "1e-45"},
 }
 
 func TestFloatMinMax(t *testing.T) {