Fix misspellings using 'codespell' tool

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/filesetup.c b/filesetup.c
index 33b47c9..4265e38 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -584,7 +584,7 @@
 			 * work-around a "feature" on Linux, where a close of
 			 * an fd that has been opened for write will trigger
 			 * udev to call blkid to check partitions, fs id, etc.
-			 * That polutes the device cache, which can slow down
+			 * That pollutes the device cache, which can slow down
 			 * unbuffered accesses.
 			 */
 			if (f->shadow_fd == -1)