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arm64: cdef: Clarify a slightly confusing comment

This might have said pri_taps[k]/sec_taps[k] at some earlier time.

--- a/src/arm/64/cdef.S

+++ b/src/arm/64/cdef.S

@@ -305,7 +305,7 @@

         cmhi            v22.8h, v0.8h,  \s2\().8h   // px > p1

         umin            v17.8h, v17.8h, v16.8h      // imin(abs(diff), imax())

         umin            v21.8h, v21.8h, v20.8h      // imin(abs(diff), imax())

-        dup             v19.8h, \tap                // taps[k]/taps[k]

+        dup             v19.8h, \tap                // taps[k]

         neg             v16.8h, v17.8h              // -imin()

         neg             v20.8h, v21.8h              // -imin()

         bsl             v18.16b, v16.16b, v17.16b   // constrain() = apply_sign()