Stop memory management on blanking overlay graphics

This prevents a crash in TWRP when trying to blank
the screen on devices that are using overlay graphics.

Change-Id: I155868616ffa1b211e97be97e4abe8b03dad7ca0
diff --git a/minuitwrp/graphics.c b/minuitwrp/graphics.c
index e71693a..1144640 100644
--- a/minuitwrp/graphics.c
+++ b/minuitwrp/graphics.c
@@ -831,16 +831,16 @@
 int gr_fb_blank(int blank)
 {
     int ret;
-    if (blank)
-        free_overlay(gr_fb_fd);
+    //if (blank)
+        //free_overlay(gr_fb_fd);
 
     ret = ioctl(gr_fb_fd, FBIOBLANK, blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK);
     if (ret < 0)
         perror("ioctl(): blank");
 
-    if (!blank)
-        allocate_overlay(gr_fb_fd, gr_framebuffer);
-	return ret;
+    //if (!blank)
+        //allocate_overlay(gr_fb_fd, gr_framebuffer);
+    return ret;
 }
 
 int gr_get_surface(gr_surface* surface)