msm: msm_fb: Move to using managed resources of kzalloc

Move to managed verion of kzalloc. Also checks return for failure case
which was missing.

Signed-off-by: Pramod Gurav <[e-mail]>

CC: Jean-Christophe Plagniol-Villard <[e-mail]>
CC: Tomi Valkeinen <[e-mail]>
CC: Stephen Boyd <[e-mail]>
CC: Jingoo Han <[e-mail]>
CC: Rob Clark <[e-mail]>
Signed-off-by: Tomi Valkeinen <[e-mail]>

drivers/video/fbdev/msm/msm_fb.c

···
 	mutex_init(&msmfb->panel_init_lock);
 	init_waitqueue_head(&msmfb->frame_wq);
 	INIT_WORK(&msmfb->resume_work, power_on_panel);
-	msmfb->black = kzalloc(msmfb->fb->var.bits_per_pixel*msmfb->xres,
-			       GFP_KERNEL);
+	msmfb->black = devm_kzalloc(&pdev->dev,
+				    msmfb->fb->var.bits_per_pixel*msmfb->xres,
+				    GFP_KERNEL);
+	if (!msmfb->black) {
+		ret = -ENOMEM;
+		goto error_register_framebuffer;
+	}
 
 	printk(KERN_INFO "msmfb_probe() installing %d x %d panel\n",
 	       msmfb->xres, msmfb->yres);