rename _c_helper_absolute_name to _c_helper_fieldaccess_expr

rename _c_helper_absolute_name to _c_helper_fieldaccess_expr

The function _c_helper_absolute_name was named in
a misleading way.
It computes a C-expression for accessing a field of an xcb-type.

Therefore the name _c_helper_fieldaccess_expr is more appropriate.

Signed-off-by: Christian Linhart <chris@demorecorder.com>
Message-ID: <1414679520-50871-1-git-send-email-chris@demorecorder.com>
Patch-Thread-Subject: [Xcb] xinput: make ListInputDevices work, sumof with nested expr, ...
Patch-Set: ListInputDevices
Patch-Number: libxcb 7/9
Patch-Version: V1
Signed-off-by: Christian Linhart <chris@DemoRecorder.com>