lib/fs: avoid double call to mkdir on make_path()

lib/fs: avoid double call to mkdir on make_path()

make_path() function calls mkdir two times in a row. The first one it
stores mkdir return code, and then it calls it again to check for errno.

This seems unnecessary, as we can use the return code from the first
call and check for errno if not 0.

Fixes: ac3415f5c1b1d ("lib/fs: Fix and simplify make_path()")
Acked-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Andrea Claudi <aclaudi@redhat.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>