Update CanonicalizeTest.h

Author: Sh0g0-1758

libc/test/src/math/smoke/CanonicalizeTest.h

@@ -48,8 +48,8 @@ class CanonicalizeTest : public LIBC_NAMESPACE::testing::Test {
     EXPECT_EQ(cx, -aNaN);
   }
 
-  if constexpr (LIBC_NAMESPACE::fputil::get_fp_type() == FPType::X86_Binary80) {
-    void testX64_80SpecialNumbers(CanonicalizeFunc f) {
+  void testX64_80SpecialNumbers(CanonicalizeFunc f) {
+    if constexpr (LIBC_NAMESPACE::fputil::get_fp_type() == FPType::X86_Binary80) {
       T cx;
       // Exponent   |       Significand      | Meaning
       //            | Bits 63-62 | Bits 61-0 |