_c_helper_fieldaccess_expr: remove handling for empty sep

_c_helper_fieldaccess_expr: remove handling for empty sep

The loop-variable "sep" is never empty in function
"_c_helper_fieldaccess_expr", after a fix elsewhere.
Therefore I removed the handling of the case of "sep" being empty.

Thanks to Ran Benita for the hint that this can be removed.

Signed-off-by: Christian Linhart <chris@demorecorder.com>
Reviewed-by: Ran Benita <ran234@gmail.com>
Message-ID: <545627C2.3050608@DemoRecorder.com>
Patch-Thread-Subject: [Xcb] [PATCHSET] ListInputDevices revision 2
Patch-Set: ListInputDevices
Patch-Number: libxcb 9/9
Patch-Version: V1