[FIX] Svace issues

[FIX] Svace issues

|-------------------------------------------------------|
| WGID  | Type                      | File              |
|-------------------------------------------------------|
| 83591 | NO_UNLOCK                 | ui_viewer_utils.c |
| 83589 | STATIC_OVERFLOW.SCANF     | ui_viewer_lib.c   |
| 83587 | PROC_USE.VULNERABLE       | ui_viewer_data.c  |
| 83586 | PROC_USE.VULNERABLE       | ui_viewer_utils.c |
| 83594 | NO_EFFECT                 | ui_viewer.c       |
|-------------------------------------------------------|

Change-Id: I3c4f6a4a22836d541c083ad89c3694df889ffc47
Signed-off-by: Anatolii Nikulin <nikulin.a@samsung.com>