[Bug libc/2386] New: ia64/clone2: make sure child_stack is non-NULL

["vapier at gentoo dot org" <sourceware-bugzilla@sourceware.org>]

playing with uClibc/ia64 and i noticed that a test case we have for testing 
the return value of clone() when given bum arguments was failing ... seems 
the clone2() function in ia64 never verifies child_stack like all other 
architectures

attached patch adds a check for child_stack alongside the check for 
child_fn ... i know squat about ia64 assembly so i'd be surprised if this was 
correct :)

also, this is the first test case ive written for glibc, so it too may have quirks

-- 
           Summary: ia64/clone2: make sure child_stack is non-NULL
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: vapier at gentoo dot org
                CC: glibc-bugs at sources dot redhat dot com,hjl at lucon
                    dot org
  GCC host triplet: ia64-linux


http://sourceware.org/bugzilla/show_bug.cgi?id=2386

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