https://gitlab.synchro.net/main/sbbs/-/commit/0b05ac369690392097895f18
Modified Files:
	src/sbbs3/getnode.cpp putnode.cpp userdat.c userdat.h
Log Message:
Check return value of lseek() before reading/writing node.dab records

I don't know if these seek failures are actually happening or not, but
reading from or writing to the wrong offset in the node.dab file could
explain some of the node.dab corruption I'm seeing from macOS (over
SMB share).
--- SBBSecho 3.23-Linux