Fixes uninitialized C++ encoder and decoder _state variable bug.

Fetched from: https://sources.debian.org/patches/libb64/1.2-5/

initialize-coder-state.diff patch without modifications.

Signed-off-by: Mikael Eliasson <mikael@robomagi.com>

diff --git a/include/b64/decode.h b/include/b64/decode.h
index 12b16ea..d3f7d60 100644
--- a/include/b64/decode.h
+++ b/include/b64/decode.h
@@ -24,7 +24,9 @@ namespace base64
 
 		decoder(int buffersize_in = BUFFERSIZE)
 		: _buffersize(buffersize_in)
-		{}
+		{
+			base64_init_decodestate(&_state);
+		}
 
 		int decode(char value_in)
 		{
diff --git a/include/b64/encode.h b/include/b64/encode.h
index 5d807d9..49aafdc 100644
--- a/include/b64/encode.h
+++ b/include/b64/encode.h
@@ -24,7 +24,9 @@ namespace base64
 
 		encoder(int buffersize_in = BUFFERSIZE)
 		: _buffersize(buffersize_in)
-		{}
+		{
+			base64_init_encodestate(&_state);
+		}
 
 		int encode(char value_in)
 		{