app/testpmd: fix duplicate exit

In interactive mode, when the "quit" command is issued, pmd_test_exit()
is being called twice, once through the "quit" command and the other
after termination of prompt.

Remove duplicated exit routine by removing call from "quit" command.

Steps to reproduce:
- Run testpmd in interactive mode.
- type "quit".

Fixes: af75078fec ("first public release")
Cc: stable@dpdk.org

Signed-off-by: Brian Archbold <brian.archbold@intel.com>
Acked-by: Bernard Iremonger <bernard.iremonger@intel.com>

app/test-pmd/cmdline.c

@@ -7670,7 +7670,6 @@ static void cmd_quit_parsed(__attribute__((unused)) void *parsed_result,
 			    struct cmdline *cl,
 			    __attribute__((unused)) void *data)
 {
-	pmd_test_exit();
 	cmdline_quit(cl);
 }