[CodeClean] fix svace issue

[jaeyun-jung]

Code clean, fix svace issues.

• check max number of tensors and prevent underflow.

[myungjoo]

[  503s] [Starting] nnstreamer_filter_python3
[  504s] ==================================================
[  504s]     Test Group nnstreamer_filter_python3 Starts.
[  504s] [PASSED] 1:gst-launch of case 1
[  504s] [PASSED] 1:Compare 1
[  504s] [PASSED] 2:gst-launch of case 2
[  504s] [FAILED][Critical] 2:Golden test comparison
[  504s] [PASSED] 3:gst-launch of case 3
[  504s] [FAILED][Critical] 3:Golden test comparison
[  504s] [IGNORED] 4-1:gst-launch of case 4-1
[  504s] [PASSED] 4-2:Multithreaded python script as a filter (CV2)
[  504s] ==================================================
[  504s] [FAILED] Test Group nnstreamer_filter_python3 has failed cases (3)