Btrfs: remove unnecessary IS_ERR in bio_readpage_error()

Because the value of extent_map is only a correct value or NULL,
so IS_ERR is unnecessary.

Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index e8ee39b..67fe401 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2110,7 +2110,7 @@
 		}
 		read_unlock(&em_tree->lock);
 
-		if (!em || IS_ERR(em)) {
+		if (!em) {
 			kfree(failrec);
 			return -EIO;
 		}