Change smoke test to use zero and neg_zero instead of literals

Author: overmighty

libc/test/src/math/smoke/exp10m1f_test.cpp

@@ -22,8 +22,8 @@ TEST_F(LlvmLibcExp10m1fTest, SpecialNumbers) {
             FPBits(LIBC_NAMESPACE::exp10m1f(neg_aNaN)).uintval());
   EXPECT_FP_EQ_ALL_ROUNDING(inf, LIBC_NAMESPACE::exp10m1f(inf));
   EXPECT_FP_EQ_ALL_ROUNDING(-1.0f, LIBC_NAMESPACE::exp10m1f(neg_inf));
-  EXPECT_FP_EQ_ALL_ROUNDING(0.0f, LIBC_NAMESPACE::exp10m1f(0.0f));
-  EXPECT_FP_EQ_ALL_ROUNDING(-0.0f, LIBC_NAMESPACE::exp10m1f(-0.0f));
+  EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::exp10m1f(zero));
+  EXPECT_FP_EQ_ALL_ROUNDING(neg_zero, LIBC_NAMESPACE::exp10m1f(neg_zero));
 
   EXPECT_FP_EQ_ALL_ROUNDING(9.0f, LIBC_NAMESPACE::exp10m1f(1.0f));
   EXPECT_FP_EQ_ALL_ROUNDING(99.0f, LIBC_NAMESPACE::exp10m1f(2.0f));