Bugfix in sleep time calculation

wtfstopw.asm

@@ -187,16 +187,19 @@ syscall
 ; set value for ts_sleep.tv_nsec given time_res
 ; div sleep time by 10 for each digits added bellow seconds
 mov rax, 100000000
-mov r8, [time_res]
-mov r9, 10
+xor rcx, rcx
+mov cl, [time_res]
+dec cl
+test cl, cl
+jz setsleep_loopend
+
+mov rbx, 10
 xor rdx, rdx
 setsleep_loop:
-	cmp r8, 1
-	jle setsleep_endloop
-	div r9
-	sub r8, 1
-	jmp setsleep_loop
-setsleep_endloop:
+	div rbx
+	loop setsleep_loop
+setsleep_loopend:
+
 mov [ts_sleep.tv_nsec], rax
 
 std ; set DF for string operations