fix(strcmp): set rax and rbx to 0 before cmp

ft_strcmp.s

@@ -1,19 +1,20 @@
 global ft_strcmp
 
 ft_strcmp:
-	xor rdx, rdx 
+	xor rdx, rdx
 	xor rax, rax
 .loop:
 	mov al, [rsi + rdx]
-	cmp byte [rdi + rdx], al 
+	cmp byte [rdi + rdx], al
 	jne .done
 	cmp byte [rdi + rdx], 0
 	je .done
 	inc rdx
 	jmp .loop
 .done:
+	xor rax, rax
+	xor rbx, rbx
 	mov al, byte [rdi + rdx]
 	mov bl, byte [rsi + rdx]
 	sub rax, rbx
 	ret
-