ams: address some warnings when building with gcc-12

libraries/libvapours/include/vapours/crypto/crypto_sha256_generator.hpp

@@ -47,9 +47,9 @@ namespace ams::crypto {
             };
             static constexpr size_t Asn1IdentifierSize = util::size(Asn1Identifier);
         private:
-            Impl m_impl;
+            Impl m_impl{};
         public:
-            Sha256Generator() { /* ... */ }
+            Sha256Generator() = default;
 
             void Initialize() {
                 m_impl.Initialize();

libraries/libvapours/source/crypto/crypto_sha256_generator.cpp

@@ -18,7 +18,7 @@
 namespace ams::crypto {
 
     void GenerateSha256(void *dst, size_t dst_size, const void *src, size_t src_size) {
-        Sha256Generator gen;
+        Sha256Generator gen{};
 
         gen.Initialize();
         gen.Update(src, src_size);