Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 06de5aa..8ee3bd8 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -146,7 +146,7 @@
 		if (rg->from > t)
 			return chg;
 
-		/* We overlap with this area, if it extends futher than
+		/* We overlap with this area, if it extends further than
 		 * us then we must extend ourselves.  Account for its
 		 * existing reservation. */
 		if (rg->to > t) {
@@ -842,7 +842,7 @@
 }
 
 /*
- * Increase the hugetlb pool such that it can accomodate a reservation
+ * Increase the hugetlb pool such that it can accommodate a reservation
  * of size 'delta'.
  */
 static int gather_surplus_pages(struct hstate *h, int delta)
@@ -890,7 +890,7 @@
 
 	/*
 	 * The surplus_list now contains _at_least_ the number of extra pages
-	 * needed to accomodate the reservation.  Add the appropriate number
+	 * needed to accommodate the reservation.  Add the appropriate number
 	 * of pages to the hugetlb pool and free the extras back to the buddy
 	 * allocator.  Commit the entire reservation here to prevent another
 	 * process from stealing the pages as they are added to the pool but
@@ -2043,7 +2043,7 @@
 	 * This new VMA should share its siblings reservation map if present.
 	 * The VMA will only ever have a valid reservation map pointer where
 	 * it is being copied for another still existing VMA.  As that VMA
-	 * has a reference to the reservation map it cannot dissappear until
+	 * has a reference to the reservation map it cannot disappear until
 	 * after this open call completes.  It is therefore safe to take a
 	 * new reference here without additional locking.
 	 */
@@ -2490,7 +2490,7 @@
 	/*
 	 * Currently, we are forced to kill the process in the event the
 	 * original mapper has unmapped pages from the child due to a failed
-	 * COW. Warn that such a situation has occured as it may not be obvious
+	 * COW. Warn that such a situation has occurred as it may not be obvious
 	 */
 	if (is_vma_resv_set(vma, HPAGE_RESV_UNMAPPED)) {
 		printk(KERN_WARNING