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      1 #ifndef _LINUX_STDDEF_H
      2 #define _LINUX_STDDEF_H
      3 
      4 
      5 #undef NULL
      6 #if defined(__cplusplus)
      7 #define NULL 0
      8 #else
      9 #define NULL ((void *)0)
     10 #endif
     11 
     12 
     13 #endif
     14