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      1 #ifndef _LINUX_STDDEF_H
      2 #define _LINUX_STDDEF_H
      3 
      4 
      5 
      6 #undef NULL
      7 #if defined(__cplusplus)
      8 #define NULL 0
      9 #else
     10 #define NULL ((void *)0)
     11 #endif
     12 
     13 
     14 #endif
     15