10132 smatch fixes for MDB
Reviewed by: Andy Fiddaman <andy@omniosce.org>

*** 1518,1530 ****
                  return ("[ shmem ]");
          if (map->map_flags & MDB_TGT_MAP_STACK)
                  return ("[ stack ]");
          if (map->map_flags & MDB_TGT_MAP_ANON)
                  return ("[ anon ]");
!         if (map->map_name != NULL)
!                 return (map->map_name);
          return ("[ unknown ]");
  }
  
  /*ARGSUSED*/
  static int
  print_map(void *ignored, const mdb_map_t *map, const char *name)
--- 1518,1530 ----
                  return ("[ shmem ]");
          if (map->map_flags & MDB_TGT_MAP_STACK)
                  return ("[ stack ]");
          if (map->map_flags & MDB_TGT_MAP_ANON)
                  return ("[ anon ]");
!         if (map->map_name[0] == '\0')
                  return ("[ unknown ]");
+         return (map->map_name);
  }
  
  /*ARGSUSED*/
  static int
  print_map(void *ignored, const mdb_map_t *map, const char *name)
*** 2341,2351 ****
  {
          uint64_t cnt = 10;
          const char *c;
          mdb_pipe_t p;
  
!         if (!flags & DCMD_PIPE)
                  return (DCMD_USAGE);
  
          if (argc == 1 || argc == 2) {
                  const char *num;
  
--- 2341,2351 ----
  {
          uint64_t cnt = 10;
          const char *c;
          mdb_pipe_t p;
  
!         if (!(flags & DCMD_PIPE))
                  return (DCMD_USAGE);
  
          if (argc == 1 || argc == 2) {
                  const char *num;