eCryptfs: increment extent_offset once per loop interation

The extent_offset is getting incremented twice per loop iteration through any
given page.  It should only be getting incremented once.  This bug should only
impact hosts with >4K page sizes.

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ecryptfs/crypto.c

@@ -504,7 +504,6 @@ int ecryptfs_encrypt_page(struct page *page)
 					"\n", rc);
 			goto out;
 		}
-		extent_offset++;
 	}
 out:
 	kfree(enc_extent_virt);
@@ -640,7 +639,6 @@ int ecryptfs_decrypt_page(struct page *page)
 			       "rc = [%d]\n", __FUNCTION__, rc);
 			goto out;
 		}
-		extent_offset++;
 	}
 out:
 	kfree(enc_extent_virt);