clk: bcm2835: Remove unused variable

Since commit 8ca011e ("clk: bcm-2835: Remove rounding up the
dividers"), the rem variable is still set but no longer used. Remove it.

Fixes: 8ca011e ("clk: bcm-2835: Remove rounding up the dividers")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220222140732.253819-1-maxime@cerno.tech
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: mripard

drivers/clk/bcm/clk-bcm2835.c

@@ -939,10 +939,8 @@ static u32 bcm2835_clock_choose_div(struct clk_hw *hw,
 	u32 unused_frac_mask =
 		GENMASK(CM_DIV_FRAC_BITS - data->frac_bits, 0) >> 1;
 	u64 temp = (u64)parent_rate << CM_DIV_FRAC_BITS;
-	u64 rem;
 	u32 div, mindiv, maxdiv;
 
-	rem = do_div(temp, rate);
 	div = temp;
 	div &= ~unused_frac_mask;