Fix some warnings from GCC 9

New redundant-move and pessimizing-move warnings found some

3 files changed, 3 insertions, 3 deletions

diff --git a/src/lib/hash/comb4p/comb4p.cpp b/src/lib/hash/comb4p/comb4p.cpp
index f6c20f35e..a6c40b801 100644
--- a/src/lib/hash/comb4p/comb4p.cpp
+++ b/src/lib/hash/comb4p/comb4p.cpp
@@ -74,7 +74,7 @@ std::unique_ptr<HashFunction> Comb4P::copy_state() const
    std::unique_ptr<Comb4P> copy(new Comb4P);
    copy->m_hash1 = m_hash1->copy_state();
    copy->m_hash2 = m_hash2->copy_state();
-   return std::move(copy);
+   return copy;
    }
 
 void Comb4P::add_data(const uint8_t input[], size_t length)
diff --git a/src/lib/hash/skein/skein_512.cpp b/src/lib/hash/skein/skein_512.cpp
index 3bc23a91d..87dee24ba 100644
--- a/src/lib/hash/skein/skein_512.cpp
+++ b/src/lib/hash/skein/skein_512.cpp
@@ -46,7 +46,7 @@ std::unique_ptr<HashFunction> Skein_512::copy_state() const
    copy->m_buffer = this->m_buffer;
    copy->m_buf_pos = this->m_buf_pos;
 
-   return std::move(copy);
+   return copy;
    }
 
 void Skein_512::clear()
diff --git a/src/lib/x509/x509_ext.h b/src/lib/x509/x509_ext.h
index 11e14e8d6..e8b21ef9b 100644
--- a/src/lib/x509/x509_ext.h
+++ b/src/lib/x509/x509_ext.h
@@ -207,7 +207,7 @@ class BOTAN_PUBLIC_API(2,0) Extensions final : public ASN1_Object
                {
                std::unique_ptr<T> ext(new T);
                ext->decode_inner(extn_info->second.bits());
-               return std::move(ext);
+               return ext;
                }
             }
          return nullptr;