#6 Incorrect rounding for Exp function

[pksv]

The following function has incorrect rounding.
fwiExp_8u_C1RSfs
fwiExp_8u_C3RSfs
fwiExp_16s_C1RSfs
fwiExp_16s_C3RSfs
fwiExp_8u_C1IRSfs
fwiExp_8u_C3IRSfs
fwiExp_16s_C1IRSfs
fwiExp_16s_C3IRSfs

When test case with 0, the expected answer is 1.
If we do the scale of 1, the result is 0.5, round-to-even answer is 0.
Currently, these functions return 1 as the answer.