BUILD: stick-table: fix build errors introduced by last stick-table change

Last commit 1a693fc2fd ("MEDIUM: cli: Allow multiple filter entries for "show table"")
broke the build at two places:

  src/stick_table.c: In function 'table_prepare_data_request':
  src/stick_table.c:3620:33: warning: ordered comparison of pointer with integer zero [-Wextra]
  src/stick_table.c: In function 'cli_io_handler_table':
  src/stick_table.c:3763:5: error: 'for' loop initial declarations are only allowed in C99 mode
  src/stick_table.c:3763:5: note: use option -std=c99 or -std=gnu99 to compile your code
  make: *** [src/stick_table.o] Error 1

This patch fixes both. No backport needed.
1 file changed