Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index fcc8ae7..a925bf2 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -956,7 +956,7 @@
 
 /*
  * Remove references to dquots from inode and add dquot to list for freeing
- * if we have the last referece to dquot
+ * if we have the last reference to dquot
  * We can't race with anybody because we hold dqptr_sem for writing...
  */
 static int remove_inode_dquot_ref(struct inode *inode, int type,