session.c:1970 SIGSEGV (info make functions -> <DEL>)

[Fernando Vezzosi]

Hi,
attachad is a quick & dirty patch i came out with, after finding this
bug.. to reproduce try:
        $ info make functions
        (press <DEL>)
        Segmentation Fault (core dumped)
the problem is in session.c, around line 1970.. entry is NULL, but we
try to access entry->line_number..
Please note that i did this patch while on train, going home at night
time.. surely there is something more clever to do, like parsing input
differently to assure entry is never NULL..

p.s.: once I had isolated a very little piece of code that could make
      info crash due to this bug.. but I lost it :D
      hopefully in the future I will investigate more inside Info code..
      for now I have really no time..

have a nice day

-- 
Fernando Vezzosi
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