[JFFS2] Fix unpoint length

Fix a couple of instances in JFFS2 where the unpoint() routine is
being called with the wrong length in cases where the point() routine
truncated a request.

Signed-off-by: Andy Lowe <alowe@mvista.com>
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/fs/jffs2/erase.c b/fs/jffs2/erase.c
index addd3fc..a1db918 100644
--- a/fs/jffs2/erase.c
+++ b/fs/jffs2/erase.c
@@ -340,7 +340,7 @@
 		if (retlen < c->sector_size) {
 			/* Don't muck about if it won't let us point to the whole erase sector */
 			D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", retlen));
-			c->mtd->unpoint(c->mtd, ebuf, jeb->offset, c->sector_size);
+			c->mtd->unpoint(c->mtd, ebuf, jeb->offset, retlen);
 			goto do_flash_read;
 		}
 		wordebuf = ebuf-sizeof(*wordebuf);