mke2fs.c: return error when failed to populate fs

We need return retval when "mke2fs -d" failed, otherwise the "$?"
would be 0 which is misleading.

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
1 file changed