Revert "Remove useless assignation"
This reverts commit 33835542. It segfaults as p_next is now uninitialized. ==25869== Conditional jump or move depends on uninitialised value(s) ==25869== at 0x5078332: GetNextItem (tree.c:441) ==25869== by 0x5078D7A: playlist_GetNextLeaf (tree.c:362) ==25869== by 0x5071CFE: ResetCurrentlyPlaying (thread.c:197) ==25869== by 0x5072952: Thread (thread.c:596) ==25869== by 0x577AFC6: start_thread (in /lib/libpthread-2.7.so) ==25869== by 0x5EE65AC: clone (in /lib/libc-2.7.so)
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