[PATCH] drm/stm: fix warning about multiplication in condition

[Arnd Bergmann <arnd@arndb.de>]

gcc-7 complains about multiplying within a condition being
suspicious:

drivers/gpu/drm/stm/dw_mipi_dsi-stm.c: In function 'dsi_pll_get_clkout_khz':
drivers/gpu/drm/stm/dw_mipi_dsi-stm.c:117:10: error: '*' in boolean context, suggest '&&' instead [-Werror=int-in-bool-context]

The code here is correct, but can be easily rephrased to make
that more obvious. I also swap out the error handling and the normal
code path for clarity.

Fixes: b0f09a3c69d9 ("drm/stm: Add STM32 DSI controller driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/gpu/drm/stm/dw_mipi_dsi-stm.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
index 568c5d0461ea..e5b6310240fe 100644
--- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
+++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
@@ -113,11 +113,13 @@ static enum dsi_color dsi_color_from_mipi(enum mipi_dsi_pixel_format fmt)
 
 static int dsi_pll_get_clkout_khz(int clkin_khz, int idf, int ndiv, int odf)
 {
+	int divisor = idf * odf;
+
 	/* prevent from division by 0 */
-	if (idf * odf)
-		return DIV_ROUND_CLOSEST(clkin_khz * ndiv, idf * odf);
+	if (!divisor)
+		return 0;
 
-	return 0;
+	return DIV_ROUND_CLOSEST(clkin_khz * ndiv, divisor);
 }
 
 static int dsi_pll_get_params(int clkin_khz, int clkout_khz,
-- 
2.9.0