Fixes while reviewing new pushed code
NULL as argument to encrypt/decrypt should return NULL without a warning


client/mysqldump.c:
  Cleanup
  Ensure we free allocated memory
  Portability fixes
client/mysqltest.c:
  Cleanup of code during review
  Portability fixes (Don't use 'bool')
mysql-test/r/func_encrypt.result:
  NULL as argument to encrypt/decrypt should return NULL without a warning
mysql-test/r/func_encrypt_nossl.result:
  Added test of NULL argument
mysql-test/t/func_encrypt_nossl.test:
  Added test of NULL argument
sql/handler.cc:
  Cleanup during code review
sql/item_strfunc.cc:
  NULL as argument to encrypt/decrypt should return NULL without a warning
sql/sql_parse.cc:
  Fix wrong merge (fix was not needed as the previous code was reverted)
sql/sql_table.cc:
  Removed extra new line