fs/efs/super.c: fix return value

fs/efs/super.c: fix return value

When sb_bread() fails, the return value should be -EIO, fix it.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Heloise <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Firo Yang <[email protected]>
Cc: Vladimir Davydov <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>