Handle zero sized buffer requests (#1764)

* Handle zero sized buffer requests

* Removed aligned buffer initialize() and moved allocation to constructor instead

src/ngraph/runtime/aligned_buffer.cpp

@@ -29,11 +29,6 @@ runtime::AlignedBuffer::AlignedBuffer()
 }
 
 runtime::AlignedBuffer::AlignedBuffer(size_t byte_size, size_t alignment)
-{
-    initialize(byte_size, alignment);
-}
-
-void runtime::AlignedBuffer::initialize(size_t byte_size, size_t alignment)
 {
     m_byte_size = byte_size;
     if (m_byte_size > 0)
@@ -48,6 +43,11 @@ void runtime::AlignedBuffer::initialize(size_t byte_size, size_t alignment)
             m_aligned_buffer += (alignment - mod);
         }
     }
+    else
+    {
+        m_allocated_buffer = nullptr;
+        m_aligned_buffer = nullptr;
+    }
 }
 
 runtime::AlignedBuffer::~AlignedBuffer()

src/ngraph/runtime/aligned_buffer.hpp

@@ -34,7 +34,6 @@ class ngraph::runtime::AlignedBuffer
 public:
     AlignedBuffer(size_t byte_size, size_t alignment);
     AlignedBuffer();
-    void initialize(size_t byte_size, size_t alignment);
     ~AlignedBuffer();
 
     size_t size() const { return m_byte_size; }