mtd: mtdswap: fix spelling mistake: 'TRESHOLD' -> 'THRESHOLD'

Trivial fix to spelling mistakes.
Signed-off-by: NArvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: NRichard Weinberger <richard@nod.at>

drivers/mtd/mtdswap.c

@@ -50,7 +50,7 @@
  * Number of free eraseblocks below which GC can also collect low frag
  * blocks.
  */
-#define LOW_FRAG_GC_TRESHOLD	5
+#define LOW_FRAG_GC_THRESHOLD	5
 
 /*
  * Wear level cost amortization. We want to do wear leveling on the background
@@ -805,7 +805,7 @@ static int __mtdswap_choose_gc_tree(struct mtdswap_dev *d)
 {
 	int idx, stopat;
 
-	if (TREE_COUNT(d, CLEAN) < LOW_FRAG_GC_TRESHOLD)
+	if (TREE_COUNT(d, CLEAN) < LOW_FRAG_GC_THRESHOLD)
 		stopat = MTDSWAP_LOWFRAG;
 	else
 		stopat = MTDSWAP_HIFRAG;