Description of problem:
Hello there,

I have just tried to compile package gimp-1.2.3-16 from Redhat 9.0
with compiler flag -Wall

The compiler says

paint_funcs.c:994: warning: operation on `tmp' may be undefined
paint_funcs.c:994: warning: operation on `tmp' may be undefined

The source code is

          dest[b] = INT_MULT(src1[b], src1[b] + INT_MULT(2 * src2[b],
                                                         255 - src1[b],
                                                         tmp), tmp);

You might be better off with something like this

    const int tmp2 = INT_MULT(2 * src2[b], 255 - src1[b], tmp);
    dest[b] = INT_MULT(src1[b], src1[b] + tmp2, tmp);



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