staging: speakup: Remove unnecessary test in if condition

Remove unnecessary test on synth->alive since it has already been
tested previously.

This fixes the following smatch warning:
drivers/staging/speakup/synth.c:182 spk_synth_is_alive_restart() warn:
we tested 'synth->alive' before and it was 'false'
Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/speakup/synth.c

@@ -179,7 +179,7 @@ int spk_synth_is_alive_restart(struct spk_synth *synth)
 {
 	if (synth->alive)
 		return 1;
-	if (!synth->alive && spk_wait_for_xmitr() > 0) {
+	if (spk_wait_for_xmitr() > 0) {
 		/* restart */
 		synth->alive = 1;
 		synth_printf("%s", synth->init);