lib subcmd: Avoid memory leak in exclude_cmds

exclude_cmds will shorten the cmds names array, before doing so free the
removed entry.

Signed-off-by: Ian Rogers <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: André Almeida <[e-mail]>
Cc: Darren Hart <[e-mail]>
Cc: Davidlohr Bueso <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/lib/subcmd/help.c

···
 	while (ci < cmds->cnt && ei < excludes->cnt) {
 		cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
 		if (cmp < 0) {
+			zfree(&cmds->names[cj]);
 			cmds->names[cj++] = cmds->names[ci++];
 		} else if (cmp == 0) {
 			ci++;
···
 		}
 	}
 
-	while (ci < cmds->cnt)
+	while (ci < cmds->cnt) {
+		zfree(&cmds->names[cj]);
 		cmds->names[cj++] = cmds->names[ci++];
-
+	}
+	for (ci = cj; ci < cmds->cnt; ci++)
+		zfree(&cmds->names[ci]);
 	cmds->cnt = cj;
 }