Unnecessary ‘else’ after ‘return’. (No-else-return)

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What that is basically saying is that the else part of the if statement is unnecessary if there is a return in the if part.
Something like this is what it expects: 

if (cctot <= 3 && cctot > 0) {
      alert('Credit under $3.00 not allowed');
      return Number.MIN_SAFE_INTEGER; // important to return 0 so we can check for these conditions for validation
}
cctot *= -1;

In general, this:

if (condition) {
  return something;
} else {
  // do another thing
}

return anotherThing;

is similar to:

if (condition) {
  return something;
}

// do another thing
return anotherThing;

After the if with a return statement, there is no need for the else part as the code below the if will only run when the condition stated is not fulfilled.

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