[FIX] prevent issues

[FIX] prevent issues

|--------|------------------------------|-----------|------------|
| CID    | Type                         | File      | Function   |
|--------|------------------------------|-----------|------------|
| 377075 | Dereference after null check | da_inst.c | new_app    |
| 373010 | Resource leak                | da_inst.c | new_app    |
| 351955 | Untrusted value as argument  | threads.c | recvThread |
|--------|------------------------------|-----------|------------|

Change-Id: Ie97fd82c6f56fb1c05cd837fb251e681c70fdf86
Signed-off-by: Vitaliy Cherepanov <v.cherepanov@samsung.com>