found by coverity, cppcheck
[src/Cedar/BridgeUnix.c:270] -> [src/Cedar/BridgeUnix.c:279]: (style) Variable 'ret' is reassigned a value before the old one has been used.
[src/Cedar/BridgeUnix.c:560] -> [src/Cedar/BridgeUnix.c:569]: (style) Variable 't' is reassigned a value before the old one has been used.
[src/Cedar/BridgeUnix.c:1528] -> [src/Cedar/BridgeUnix.c:1537]: (style) Variable 'ret' is reassigned a value before the old one has been used.
[src/Cedar/BridgeUnix.c:1278]: (style) Unused variable: c
[src/Cedar/BridgeUnix.c:1090]: (style) The function 'DlipAttachRequest' is never used.