[PATCH net] selftests/net: tcp_mmap: remove unused -k option and keepflag

[Greg Thelen <gthelen@google.com>]

Commit aacb0c2e524c ("selftests: net: tcp_mmap must use
TCP_ZEROCOPY_RECEIVE") removed the only read of keepflag in child_thread(),
leaving the file-scope keepflag variable set by the -k option in main() but
never read. This triggers a Clang 23 warning:

  tcp_mmap.c:91:12: error: variable 'keepflag' set but not used
  [-Werror,-Wunused-but-set-global]

Remove the unused keepflag variable and the dead -k getopt option.

Fixes: aacb0c2e524c ("selftests: net: tcp_mmap must use TCP_ZEROCOPY_RECEIVE")
Signed-off-by: Greg Thelen <gthelen@google.com>
---
 tools/testing/selftests/net/tcp_mmap.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/tools/testing/selftests/net/tcp_mmap.c b/tools/testing/selftests/net/tcp_mmap.c
index 487ae659a1f1..86241bed7f08 100644
--- a/tools/testing/selftests/net/tcp_mmap.c
+++ b/tools/testing/selftests/net/tcp_mmap.c
@@ -85,7 +85,6 @@ static int rcvbuf; /* Default: autotuning.  Can be set with -r <integer> option
 static int sndbuf; /* Default: autotuning.  Can be set with -w <integer> option */
 static int zflg; /* zero copy option. (MSG_ZEROCOPY for sender, mmap() for receiver */
 static int xflg; /* hash received data (simple xor) (-h option) */
-static int keepflag; /* -k option: receiver shall keep all received file in memory (no munmap() calls) */
 static int integrity; /* -i option: sender and receiver compute sha256 over the data.*/
 
 static size_t chunk_size  = 512*1024;
@@ -456,7 +455,7 @@ int main(int argc, char *argv[])
 	int sflg = 0;
 	int mss = 0;
 
-	while ((c = getopt(argc, argv, "46p:svr:w:H:zxkP:M:C:a:i")) != -1) {
+	while ((c = getopt(argc, argv, "46p:svr:w:H:zxP:M:C:a:i")) != -1) {
 		switch (c) {
 		case '4':
 			cfg_family = PF_INET;
@@ -490,9 +489,6 @@ int main(int argc, char *argv[])
 		case 'x':
 			xflg = 1;
 			break;
-		case 'k':
-			keepflag = 1;
-			break;
 		case 'P':
 			max_pacing_rate = atoi(optarg) ;
 			break;
-- 
2.56.0.212.g129ede20d9-goog