drm/amd/display: Possible divide by zero in set_speed()

If "speed" is zero then we use it as a divisor to find "prescale".  It's
better to move the check for zero to the very start of the function.

Fixes: 9eeec26a ("drm/amd/display: Refine i2c frequency calculating sequence")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c

@@ -267,6 +267,9 @@ static void set_speed(
 	uint32_t xtal_ref_div = 0;
 	uint32_t prescale = 0;
 
+	if (speed == 0)
+		return;
+
 	REG_GET(MICROSECOND_TIME_BASE_DIV, XTAL_REF_DIV, &xtal_ref_div);
 
 	if (xtal_ref_div == 0)
@@ -274,7 +277,6 @@ static void set_speed(
 
 	prescale = ((dce_i2c_hw->reference_frequency * 2) / xtal_ref_div) / speed;
 
-	if (speed) {
 	if (dce_i2c_hw->masks->DC_I2C_DDC1_START_STOP_TIMING_CNTL)
 		REG_UPDATE_N(SPEED, 3,
 			     FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_PRESCALE), prescale,
@@ -284,7 +286,6 @@ static void set_speed(
 		REG_UPDATE_N(SPEED, 2,
 			     FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_PRESCALE), prescale,
 			     FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_THRESHOLD), 2);
-	}
 }
 
 static bool setup_engine(