[9fans] 6c bug?

[erik quanstrom]

for p = uchar*, Nbus==256,

                if((uint)p[1] >= Nbus){

generates

        warning: ./mp.c:212 useless or misleading comparison: UCHAR >= 0x100

i'm pretty sure that 6c is incorrectly issuing the diagnostic before
applying the cast.  (the cast is there to shut the compiler up.)

- erik