[Bug mi/15806] file path separator becomes "\\\\" instead of "\\" when GDB report breakpoint-modified in MI mode

["asmwarrior at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=15806

--- Comment #3 from asmwarrior <asmwarrior at gmail dot com> ---
Some analysis. 
We have many usage of ui_file redirect in GDB source code

For example:

  ui_out_redirect (mi_uiout, mi->event_channel);
  TRY_CATCH (e, RETURN_MASK_ERROR)
    gdb_breakpoint_query (mi_uiout, b->number, NULL);
  ui_out_redirect (mi_uiout, NULL);

  gdb_flush (mi->event_channel);

The contents(buffer) has two chance of running the function: printchar(). When
printchar see a \, it will replace it with another \, so we get doubled
backslash.

Then, in gdb_flush function, we get another doubled backslash. (the printchar()
function also called in gdb_flush), my idea is that: is it possible to avoid
calling printchar() in the gdb_flush function?), it looks like the
mi_event_channel already have backslash doubled.

Another case is that if a new line character first get chance to becomes \n,
then if printchar() called again, it will becomes \\n.

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