error_logger unexpected behaviour & a patch to fix it

[Matthias Lang]

Hi,

If 

   error_logger:tty(true)

is called when tty logging is already enabled, the error logger
repeats itself on the tty repeats itself on the tty. Example:

   3> error_logger:tty(true).
   ok
   4> error_logger:info_report("sometimes I can't trust my ears").
   
   =INFO REPORT==== 13-Aug-2002::09:42:25 ===
   sometimes I can't trust my ears
   
   =INFO REPORT==== 13-Aug-2002::09:42:25 ===
   sometimes I can't trust my eyes

This happens on R8B-1 and the source hasn't changed in R8B-2. Trivial
patch attached.

Matt

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