[Bug cli/14392] New: list ,5 crashes GDB with a SEGFAULT

["kevin.pouget at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14392

             Bug #: 14392
           Summary: list ,5 crashes GDB with a SEGFAULT
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: cli
        AssignedTo: unassigned@sourceware.org
        ReportedBy: kevin.pouget@gmail.com
    Classification: Unclassified


`help list` specifies that last can have two arguments:

> One argument specifies a line, and ten lines are listed around that line.
> Two arguments with comma between specify starting and ending lines to list.

But if you forget the first argument, GDB crashes with a SEGFAULT:

$ where
#0  0x00000000004d8947 in filter_sals (sals=0x7fff2b82f4d0)    at
.../gdb/cli/cli-cmds.c:1521
#1  0x00000000004d7664 in list_command (arg=0xc83732 ",5", from_tty=1)    at
.../gdb/cli/cli-cmds.c:964

it looks like `sals` is never initialized when the arguments starts with a ','.

GDB HEAD is affected, but not the one from Fedora 17 package
(7.4.50.20120120-49.fc17)

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