clk: sprd: composite: Simplify determine_rate implementation

The sprd_div_helper_round_rate() function calls divider_round_rate()
which calls divider_round_rate_parent() which calls
divider_determine_rate(). This call chain converts back and forth from
the rate request structure to make a determine_rate clk_op fit with a
round_rate clk_op. Simplify the code here by directly calling
divider_determine_rate() instead.

This fixes a smatch warning where an unsigned long is compared to less
than zero, which is impossible. This makes sprd_div_helper_round_rate()
unnecessary as well so simply remove it and fold it into the only caller
left.

Reported-by: Harshit Mogalapalli <[email protected]>
Closes: https://lore.kernel.org/r/[email protected]
Cc: Maxime Ripard <[email protected]>
Fixes: 302d2f836d78 ("clk: sprd: composite: Switch to determine_rate")
Signed-off-by: Stephen Boyd <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Maxime Ripard <[email protected]>

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