OMAP: DSS2: Replace strncmp() with sysfs_streq() in overlay_manager_store()

The function overlay_manager_store currently fails if the sysfs input is a
prefix string of an existing overlay manager name. This occurs because strncmp
compares the two strings only till the length of the input sysfs string. So a
sysfs input "lcd" will match manager name "lcd2" which is incorrect behavior.

The use of sysfs_streq here will prevent this false positive match to occur.
Signed-off-by: Archit Taneja <archit@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>

drivers/video/omap2/dss/overlay.c

@@ -65,7 +65,7 @@ static ssize_t overlay_manager_store(struct omap_overlay *ovl, const char *buf,
 		for (i = 0; i < omap_dss_get_num_overlay_managers(); ++i) {
 			mgr = omap_dss_get_overlay_manager(i);
 
-			if (strncmp(buf, mgr->name, len) == 0)
+			if (sysfs_streq(buf, mgr->name))
 				break;
 
 			mgr = NULL;