Segfault in dataentry() (PR#391)

[p.dalgaard@pubhealth.ku.dk]

> dataentry(0,0)

Program received signal SIGSEGV, Segmentation fault.
0x808991c in duplicate (s=0x0) at ../../../R/src/main/duplicate.c:42
42	    switch (TYPEOF(s)) {

Apparently that one doesn't get trapped by the no-segfault checks.
Martin? 

(It's not too high priority to fix, but confusing data.entry and
dataentry provokes this quite easily.)

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907

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