[Bug gdb/21164] New: "maint print symbols,msymbols,psymbols" without arguments all crash

["palves at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21164

            Bug ID: 21164
           Summary: "maint print symbols,msymbols,psymbols" without
                    arguments all crash
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: palves at redhat dot com
  Target Milestone: ---

Current master, 

 $ gdb
 GNU gdb (GDB) 7.12.50.20170214-git
 [....]
 (gdb) maint print msymbols 
 Segmentation fault (core dumped)

Likewise for "maint print psymbols/symbols".  Started happening with:

 commit 34c41c681f4a0a0dfe0405c7d2aecf458520557a
 Author:     Doug Evans <xdje42@gmail.com>
 AuthorDate: Mon Dec 19 08:33:46 2016 -0800

    New syntax for mt print symbols,msymbols,psymbols.

Before that commit:

 GNU gdb (GDB) 7.12.50.20161222-git
 (gdb) maint print symbols 
 Arguments missing: an output file name and an optional symbol file name
 (gdb) maint print psymbols 
 print-psymbols takes an output file name and optional symbol file name
 (gdb) maint print msymbols 
 print-msymbols takes an output file name and optional symbol file name

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