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pipewire: module-profiler: fix misaligned access

Barnabás Pőcze requested to merge pobrn/pipewire:mod_profiler_fix_misaligned_acc into master 
Fix the following misaligned access that happens when `pw-top` is started:

  ../src/modules/module-profiler.c:144:5: runtime error: member access within misaligned address 0x7f7fa11fe8d9 for type 'struct spa_pod_struct', which requires 4 byte alignment
  0x7f7fa11fe8d9: note: pointer points here
   60 00 00  01 00 00 00 00 00 00 00  00 88 02 00 00 0f 00 00  00 0a 00 04 00 00 00 00  00 01 00 01 00
                ^
      #0 0x7f7fa64a65e1 in do_flush_event ../src/modules/module-profiler.c:144
      #1 0x7f7fa36d658e in source_event_func ../spa/plugins/support/loop.c:650
      #2 0x7f7fa36cfbab in loop_iterate ../spa/plugins/support/loop.c:483
      #3 0x7f7fa80a71cd in pw_main_loop_run ../src/pipewire/main-loop.c:128
      #4 0x55af46ff4722 in main ../src/daemon/pipewire.c:111
      #5 0x7f7fa8a3984f  (/usr/lib/libc.so.6+0x2384f) (BuildId: 2f005a79cd1a8e385972f5a102f16adba414d75e)
      #6 0x7f7fa8a39909 in __libc_start_main (/usr/lib/libc.so.6+0x23909) (BuildId: 2f005a79cd1a8e385972f5a102f16adba414d75e)
      #7 0x55af46ff32a4 in _start (src/daemon/pipewire+0x42a4) (BuildId: 2d6250e405f52fb86992fef8584ccfdfdb85569f)

  SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../src/modules/module-profiler.c:144:5 in

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