f2fs: give -E2BIG for no space in xattr

This patch returns -E2BIG if there is no space to add an xattr entry.
This should fix generic/026 in xfstests as well.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/xattr.c

@@ -500,7 +500,7 @@ static int __f2fs_setxattr(struct inode *inode, int index,
 			free = free + ENTRY_SIZE(here);
 
 		if (unlikely(free < newsize)) {
-			error = -ENOSPC;
+			error = -E2BIG;
 			goto exit;
 		}
 	}