Remove unnecessary assignment to register

src/lib/newchecksum.dasl

@@ -42,8 +42,7 @@ local function gen_checksum ()
       | 1:
       | cmp rcx, 32                 -- If index is less than 16.
       | jl >2                       -- Jump to branch '2'.
-      | mov r9, [rdi + r8]          -- Fetch 64-bit from data + r8 into r9.
-      | add rax, r9                 -- Sum acc with qword[0].
+      | add rax, [rdi + r8]         -- Sum acc with qword[0].
       | adc rax, [rdi + r8 + 8]     -- Sum with carry qword[1].
       | adc rax, [rdi + r8 + 16]    -- Sum with carry qword[2].
       | adc rax, [rdi + r8 + 24]    -- Sum with carry qword[3]
@@ -54,17 +53,15 @@ local function gen_checksum ()
       | 2:
       | cmp rcx, 16                 -- If index is less than 16.
       | jl >3                       -- Jump to branch '2'.
-      | mov r9, [rdi + r8]          -- Fetch 64-bit from data + r8 into r9.
-      | add rax, r9                 -- Sum acc with r9.
-      | adc rax, [rdi + r8 + 8]     -- Sum with carry next qword.
+      | add rax, [rdi + r8]         -- Sum acc with qword[0].
+      | adc rax, [rdi + r8 + 8]     -- Sum with carry qword[1].
       | adc rax, 0                  -- Sum carry-bit into acc.
       | sub rcx, 16                 -- Decrease index by 8.
       | add r8, 16                  -- Jump two qwords.
       | 3:
       | cmp rcx, 8                  -- If index is less than 8.
       | jl >4                       -- Jump to branch '2'.
-      | mov r9, [rdi + r8]          -- Fetch 64-bit from data + r8 into r9.
-      | add rax, r9                 -- Sum acc with r9.
+      | add rax, [rdi + r8]         -- Sum acc with qword[0].
       | adc rax, 0                  -- Sum carry-bit into acc.
       | sub rcx, 8                  -- Decrease index by 8.
       | add r8, 8                   -- Next 64-bit.