tools/vm/page_owner_sort.c: remove -c option

The -c option is used to cull by stacktrace.  Now, --cull option has
been Added in page_owner_sort.c.  Culling by stacktrace is one of the
function of "--cull".  No need to set an extra parameter.  So remove -c
option.

Remove parsing of -c when parse parameter and remove "-c" from usage.

This work is coauthored by
        Shenghong Han
        Yixuan Cao
        Chongxi Zhao
        Jiajian Ye
        Yuhong Feng
        Yongqiang Liu

Link: https://lkml.kernel.org/r/20220326085920.1470081-1-zhangyinan2019@email.szu.edu.cnSigned-off-by: Yinan Zhang <zhangyinan2019@email.szu.edu.cn>
Cc: Chongxi Zhao <zhaochongxi2019@email.szu.edu.cn>
Cc: Georgi Djakov <georgi.djakov@linaro.org>
Cc: Jiajian Ye <yejiajian2018@email.szu.edu.cn>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Sean Anderson <seanga2@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Tang Bin <tangbin@cmss.chinamobile.com>
Cc: Yixuan Cao <caoyixuan2019@email.szu.edu.cn>
Cc: Yongqiang Liu <liuyongqiang13@huawei.com>
Cc: Yuhong Feng <yuhongf@szu.edu.cn>
Cc: Zhenliang Wei <weizhenliang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

tools/vm/page_owner_sort.c

@@ -441,7 +441,6 @@ static void usage(void)
 		"-n\t\tSort by task command name.\n"
 		"-a\t\tSort by memory allocate time.\n"
 		"-r\t\tSort by memory release time.\n"
-		"-c\t\tCull by comparing stacktrace instead of total block.\n"
 		"-f\t\tFilter out the information of blocks whose memory has been released.\n"
 		"--pid <PID>\tSelect by pid. This selects the information of blocks whose process ID number equals to <PID>.\n"
 		"--tgid <TGID>\tSelect by tgid. This selects the information of blocks whose Thread Group ID number equals to <TGID>.\n"
@@ -466,14 +465,11 @@ int main(int argc, char **argv)
 		{ 0, 0, 0, 0},
 	};
 
-	while ((opt = getopt_long(argc, argv, "acfmnprstP", longopts, NULL)) != -1)
+	while ((opt = getopt_long(argc, argv, "afmnprstP", longopts, NULL)) != -1)
 		switch (opt) {
 		case 'a':
 			cmp = compare_ts;
 			break;
-		case 'c':
-			cull = cull | CULL_STACKTRACE;
-			break;
 		case 'f':
 			filter = filter | FILTER_UNRELEASE;
 			break;