asm-generic/div64: Fix documentation of do_div() parameter

Contrary to the description, the first parameter (n) should not be passed
as a pointer, but directly as an lvalue. This is possible because do_div() is
a macro.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lkml.kernel.org/r/20190808181948.27659-1-j.neuschaefer@gmx.net

include/asm-generic/div64.h

@@ -28,12 +28,12 @@
 
 /**
  * do_div - returns 2 values: calculate remainder and update new dividend
- * @n: pointer to uint64_t dividend (will be updated)
+ * @n: uint64_t dividend (will be updated)
  * @base: uint32_t divisor
  *
  * Summary:
- * ``uint32_t remainder = *n % base;``
- * ``*n = *n / base;``
+ * ``uint32_t remainder = n % base;``
+ * ``n = n / base;``
  *
  * Return: (uint32_t)remainder
  *