ESP: Fix some unreachable code warnings

ESP: Fix some unreachable code warnings

Found with -Wunreachable-code-return clang compiler option.

The errors were:

./print-esp.c:317:10: warning: 'return' will never be executed
      [-Wunreachable-code-return]
                return 0;
                       ^
./print-esp.c:552:4: warning: 'return' will never be executed
      [-Wunreachable-code-return]
                        return;
                        ^~~~~~