C++ overload operator issues

Question

I can not solve the issues by myself when i overload the assignment operator?
Could someone help me, plz?
polynomial& polynomial::operator=(const polynomial & rhs) {
if (this == &rhs) {
return *this;
}else {
delete [] coefficients;
coefficients = new double[rhs.degree];
degree = rhs.degree;
for (int i = 0; i < degree; i++) {
coefficients[i] = rhs.coefficients[i]; // Control reaches end of non-void function
}
}
return *this; //Control reaches end of non-void function
}