fallback: find_boot_csv(): eliminate dead code.

Covscan sez:

720        FreePool(buffer);
   assignment: Assigning: buffer = NULL.
721        buffer = NULL;
722
723        CHAR16 *bootcsv=NULL, *bootarchcsv=NULL;
724
725        bs = 0;
726        do {
727                bs = 0;
728                rc = uefi_call_wrapper(fh->Read, 3, fh, &bs, NULL);
729                if (EFI_ERROR(rc) && rc != EFI_BUFFER_TOO_SMALL) {
730                        Print(L"Could not read \\EFI\\%s\\: %d\n", dirname, rc);
   null: At condition buffer, the value of buffer must be NULL.
   dead_error_condition: The condition buffer cannot be true.
731                        if (buffer)
   CID 182851 (#1 of 1): Logically dead code (DEADCODE)dead_error_line:
   Execution cannot reach this statement: FreePool(buffer);.
732                                FreePool(buffer);
733                        return rc;
734                }

And it's right; buffer can never be non-NULL there.  So just take that
out.

Signed-off-by: Peter Jones <pjones@redhat.com>

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