disp: msm: dsi: fix gpio warning message

At present, the sim panels and physical panels booting up as sim
panels have a call flow issue causing reset gpio to be set in the
panel reset sequence even without valid reset gpio. This causes
GPIO warnings as it tries to set value for invalid reset GPIO.
The following change fixes these GPIO warnings, by checking
valid reset GPIO before setting value.

Change-Id: Id8f54a563c61dd3d244d31b10081042e376287d4
Signed-off-by: Santosh Kumar Aenugu <santoshkumar@codeaurora.org>

msm/dsi/dsi_panel.c

@@ -247,6 +247,9 @@ static int dsi_panel_reset(struct dsi_panel *panel)
 	struct dsi_panel_reset_config *r_config = &panel->reset_config;
 	int i;
 
+	if (!gpio_is_valid(r_config->reset_gpio))
+		goto skip_reset_gpio;
+
 	if (gpio_is_valid(panel->reset_config.disp_en_gpio)) {
 		rc = gpio_direction_output(panel->reset_config.disp_en_gpio, 1);
 		if (rc) {
@@ -274,6 +277,7 @@ static int dsi_panel_reset(struct dsi_panel *panel)
 				(r_config->sequence[i].sleep_ms * 1000) + 100);
 	}
 
+skip_reset_gpio:
 	if (gpio_is_valid(panel->bl_config.en_gpio)) {
 		rc = gpio_direction_output(panel->bl_config.en_gpio, 1);
 		if (rc)