ntdll: Avoid one of the calls to getattrlist() when read_directory_getattrlist() checks the case sensitivity of the file system.

[Ken Thomases]

Extract a new function, get_dir_case_sensitivity_attr_by_id(), from
get_dir_case_sensitivity_attr().  Call that instead of get_dir_case_sensitivity()
from read_directory_getattrlist().  We get the device and file system IDs from
the same getattrlist() call we're already doing, so that avoids an extra call.

Although get_dir_case_sensitivity() has a fallback to a stat()-based function,
it's only used where getattrlist() isn't available or it failed to get the
device or file system IDs.  At the point in read_directory_getattrlist() where
we're calling get_dir_case_sensitivity_attr_by_id(), we've already passed those
conditions.
---
dlls/ntdll/directory.c | 62 ++++++++++++++++++++++++++++++++------------------
1 file changed, 40 insertions(+), 22 deletions(-)

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