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Tests for the condition where the minimum age is less than any window's
current age, in which case we can get a NULL dereference if the
windows_reset_all() implementation is broken.

    windows.c:409:23: runtime error: member access within null pointer of type 'struct window_context'
    ASAN:DEADLYSIGNAL
    =================================================================
    ==31400==ERROR: AddressSanitizer: SEGV on unknown address 0x00000004 (pc 0x0002b658 bp 0x74c00270 sp 0x7eb7c678 T0)
    ==31400==The signal is caused by a WRITE memory access.
    ==31400==Hint: address points to the zero page.
        #0 0x2b657 in window_reset windows.c:410
        #1 0x2cc9b in windows_create_map windows.c:572
        #2 0x1f3f3 in protocol_v1_create_window protocol.c:167
        #3 0x2121b in protocol_v2_create_window protocol.c:417
        #4 0x24cd7f in generic_vpnor_create_window vpnor/protocol.cpp:51
        #5 0x24d053 in protocol_v2_vpnor_create_window vpnor/protocol.cpp:63
        #6 0x2663b in mbox_handle_create_window transport_mbox.c:282
        #7 0x276db in handle_mbox_req transport_mbox.c:568
        #8 0x276db in transport_mbox_dispatch transport_mbox.c:649
        #9 0x17fcb in poll_loop mboxd.c:185
        #10 0x17fcb in main mboxd.c:423
        #11 0x46b68517 in __libc_start_main (/lib/libc.so.6+0x46b68517)

    AddressSanitizer can not provide additional info.
    SUMMARY: AddressSanitizer: SEGV windows.c:410 in window_reset
    ==31400==ABORTING

Change-Id: I8161e2ea17953e196d4bb3ca90d19e44ec10c86d
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>