Source code ecdh.c: potentially uninitialized local pointer variable

Hi all I am now working with the provided ecdh.c and ecdh.h codes.
I didn't change any thing but the error shows:
potentially uninitialized local pointer variable 'q' used ecdh.c line 624
potentially uninitialized local pointer variable 'a' used ecdh.c line 624
potentially uninitialized local pointer variable 'b' used ecdh.c line 624
potentially uninitialized local pointer variable 'r' used ecdh.c line 632
...... an so on. All the same type of error.
Perhaps the code should be updated? I would appreciate for any suggestions or tips!

I just copy the all initialization parts before the if(). Then it should works. Hopes that is helpful to anyone meet the same problem.