regmap: Skip clk_put for attached clocks when freeing context

Capability to attach an existing clk to a MMIO regmap was
introduced in 4.17rc1.

However, when using attached clk, regmap does not do the clk_get.
Therefore it should not do the clk_put when freeing the MMIO
regmap context.

There does not appear to be any users of attached clocks yet
so this would be a good time to make this change before anything
depends on the existing behaviour.

Signed-off-by: James Kelly <jamespeterkelly@gmail.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/base/regmap/regmap-mmio.c

@@ -206,7 +206,8 @@ static void regmap_mmio_free_context(void *context)
 
 	if (!IS_ERR(ctx->clk)) {
 		clk_unprepare(ctx->clk);
-		clk_put(ctx->clk);
+		if (!ctx->attached_clk)
+			clk_put(ctx->clk);
 	}
 	kfree(context);
 }