ensure mbstate is 0-initialized in tests

Author: uzairnawaz

libc/test/src/__support/wchar/utf32_to_8_test.cpp

@@ -13,7 +13,7 @@
 #include "test/UnitTest/Test.h"
 
 TEST(LlvmLibcCharacterConverterUTF32To8Test, OneByte) {
-  LIBC_NAMESPACE::internal::mbstate state;
+  LIBC_NAMESPACE::internal::mbstate state{0, 0, 0};
   LIBC_NAMESPACE::internal::CharacterConverter cr(&state);
 
   // utf8 1-byte encodings are identical to their utf32 representations
@@ -37,7 +37,7 @@ TEST(LlvmLibcCharacterConverterUTF32To8Test, OneByte) {
 }
 
 TEST(LlvmLibcCharacterConverterUTF32To8Test, TwoByte) {
-  LIBC_NAMESPACE::internal::mbstate state;
+  LIBC_NAMESPACE::internal::mbstate state{0, 0, 0};
   LIBC_NAMESPACE::internal::CharacterConverter cr(&state);
 
   // testing utf32: 0xff -> utf8: 0xc3 0xbf
@@ -70,7 +70,7 @@ TEST(LlvmLibcCharacterConverterUTF32To8Test, TwoByte) {
 }
 
 TEST(LlvmLibcCharacterConverterUTF32To8Test, ThreeByte) {
-  LIBC_NAMESPACE::internal::mbstate state;
+  LIBC_NAMESPACE::internal::mbstate state{0, 0, 0};
   LIBC_NAMESPACE::internal::CharacterConverter cr(&state);
 
   // testing utf32: 0xac15 -> utf8: 0xea 0xb0 0x95
@@ -111,7 +111,7 @@ TEST(LlvmLibcCharacterConverterUTF32To8Test, ThreeByte) {
 }
 
 TEST(LlvmLibcCharacterConverterUTF32To8Test, FourByte) {
-  LIBC_NAMESPACE::internal::mbstate state;
+  LIBC_NAMESPACE::internal::mbstate state{0, 0, 0};
   LIBC_NAMESPACE::internal::CharacterConverter cr(&state);
 
   // testing utf32: 0x1f921 -> utf8: 0xf0 0x9f 0xa4 0xa1