Bitstrings and hexstrings now clear unused bits after JSON decoding (bug 560937)

Change-Id: Id5292da9b7ac6672c6a88aa9b44ef7946b157e60
Signed-off-by: Botond Baranyi <botond.baranyi@ericsson.com>

core/Bitstring.cc

@@ -1253,6 +1253,7 @@ int BITSTRING::JSON_decode(const TTCN_Typedescriptor_t& p_td, JSON_Tokenizer& p_
             ++bit_index;
           }
         }
+        clear_unused_bits();
       }
     } else {
       error = TRUE;

core/Hexstring.cc

@@ -1132,6 +1132,7 @@ int HEXSTRING::JSON_decode(const TTCN_Typedescriptor_t& p_td, JSON_Tokenizer& p_
           set_nibble(nibble_index, char_to_hexdigit(value[i]));
           ++nibble_index;
         }
+        clear_unused_nibble();
       }
     } else {
       error = TRUE;