Fix Coverity issues

[Liran-Ar]

Fix the following NVOS-SwSS module Coverity issues:
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- Uncaught execption, in /src/nvos-swss/orchagent/main.cpp 
- Uninitialized scalar field, in /src/nvos-swss/orchagent/port.h 
- Uninitialized scalar field, in /src/nvos-swss/orchagent/port.h 
- Unchecked return value, in /src/nvos-swss/orchagent/portsorch.cpp 
- Pointer to local outside scope, in /src/nvos-swss/orchagent/portsorch.cpp 
- Uncaught execption, in /src/nvos-swss/portsyncd/portsyncd.cpp 
- Uncaught execption, in /src/nvos-swss/portsyncd/portsyncd.cpp

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: Liran-Ar (4fd1c3cd143da3a1ea5f9fbe235fd5343482f911)

[orfar1994]

/easycla