[PATCH] mmc: Fix static checker warnings

[Venkatesh Yadav Abbarapu]

Correct pointer dereferencing check to be more consistent.

Eliminate the below smatch warning:
drivers/mmc/mmc.c:3118 mmc_init_device()
warn: variable dereferenced before check 'm' (see line 3116)

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu at amd.com>
---

 drivers/mmc/mmc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 0b7c0be8cb..210703ea46 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -3113,10 +3113,12 @@ int mmc_init_device(int num)
 	}
 
 	m = mmc_get_mmc_dev(dev);
-	m->user_speed_mode = MMC_MODES_END; /* Initialising user set speed mode */
-
 	if (!m)
 		return 0;
+
+	/* Initialising user set speed mode */
+	m->user_speed_mode = MMC_MODES_END;
+
 	if (m->preinit)
 		mmc_start_init(m);
 
-- 
2.17.1