SBB command error

[Pranabendra Prasad Chandra]

Initially, CY = 0. Upon running the following code,

	MVI A,01H
	MVI B,FFH
	SBB B
	STA 0020H
	HLT

the output is 02H in 0020H, which is correct.

Now, initially, when CY = 0, upon running this code,

	MVI A,01H
	MVI B,FFH
        STC
	SBB B
	STA 0020H
	HLT

the output is 03H in 0020H. But, the correct answer is 01H.

After studying the codebase of this project, I could relate this bug to these lines below :
In the 2nd case, STC puts CY = 1. Therefore,

sim8085/src/core/8085.c

Line 959 in 9634aeb

 if (state->cc.cy) 

is true,
and hence,

sim8085/src/core/8085.c

Line 960 in 9634aeb

 rhs--; 

Here, as value of B is rhs, I think rhs++ or lhs-- will give the correct results.