Remove warnings by casting

cmd-line-utils/readline/histfile.c:
  Remove warning (compare signed & unsigned)
sql/udf_example.c:
  Remove warning (cast integer to pointer of different size)
strings/decimal.c:
  Remove warning (%lx format, double arg)

cmd-line-utils/readline/histfile.c

@@ -334,7 +334,8 @@ history_truncate_file (fname, lines)
   file_size = (size_t)finfo.st_size;
 
   /* check for overflow on very large files */
-  if (file_size != finfo.st_size || file_size + 1 < file_size)
+  if ((long long) file_size != (long long) finfo.st_size ||
+      file_size + 1 < file_size)
     {
       close (file);
 #if defined (EFBIG)

sql/udf_example.c

@@ -1087,7 +1087,7 @@ my_bool is_const_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
     strmov(message, "IS_CONST accepts only one argument");
     return 1;
   }
-  initid->ptr= (char*)((args->args[0] != NULL) ? 1 : 0);
+  initid->ptr= (char*)((args->args[0] != NULL) ? 1UL : 0);
   return 0;
 }
 

strings/decimal.c

@@ -971,7 +971,7 @@ int decimal2double(decimal_t *from, double *to)
 
   *to= from->sign ? -result : result;
 
-  DBUG_PRINT("info", ("result: %f (%lx)", *to, *to));
+  DBUG_PRINT("info", ("result: %f (%lx)", *to, *(ulong *)to));
 
   return E_DEC_OK;
 }