Optimize compiled code size

[b1ek]

i have removed a few things to reduce the code size:

• pointless status code check:

  
  __AMBER_STATUS=$?; # only useful line
  if [ $__AMBER_STATUS != 0 ]; then # ???
  : # ???
  fi; # ???
  ``

• variables like __AMBER_STATUS -> __AS
• removing ; at the end of the line when its not required. kind of a micro optimization, but could save a few kilobytes on large project

those are pretty harmless optimizations, and all the cargo tests pass. i made sure that all hardcoded variables are renamed in the code. you can verify it via grep -n __VARIABLE_NAME $(git ls-files | grep -E \\.rs\$).

[Ph0enixKM]

@b1ek That's great! I wanted to fix these pointless code checks some time ago but didn't have time to do so 🎉