tash: fix duplicate variable declaration
tash: fix duplicate variable declaration

If two configs, CONFIG_TASH_QSIZE and CONFIG_TASH_PASSWORD, are enabled,
it makes build error because duplicated variable declaration.

Change-Id: I1e62312d3b310a9fcbcb184883f6f500e9a009d1
Signed-off-by: Junhwan Park <7fee488b6f78fc50b291ffc7d10428788977e877@samsung.com>

JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT