[patch -next] drm: dereferencing before checking for null

[Dan Carpenter <error27@gmail.com>]

The original code dereferences "fb_helper_conn" before verifying that
it's non-null.

Signed-off-by: Dan Carpenter <error27@gmail.com>
---
It's never null here actually.  I could send a patch to remove the check
instead if that's prefered.

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index b28e563..f5fe3a9 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -96,11 +96,12 @@ static bool drm_fb_helper_connector_parse_command_line(struct drm_fb_helper_conn
 	int i;
 	enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
 	struct drm_fb_helper_cmdline_mode *cmdline_mode;
-	struct drm_connector *connector = fb_helper_conn->connector;
+	struct drm_connector *connector;
 
 	if (!fb_helper_conn)
 		return false;
 
+	connector = fb_helper_conn->connector;
 	cmdline_mode = &fb_helper_conn->cmdline_mode;
 	if (!mode_option)
 		mode_option = fb_mode_option;

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