[PATCH net-next v2] selftests/net: initialize char variable to null

char variable in 'so_txtime.c' & 'txtimestamp.c' were left uninitilized
when switch default case taken. which raises following warning.

	txtimestamp.c:240:2: warning: variable 'tsname' is used uninitialized
	whenever switch default is taken [-Wsometimes-uninitialized]

	so_txtime.c:210:3: warning: variable 'reason' is used uninitialized
	whenever switch default is taken [-Wsometimes-uninitialized]

initializing these variables to NULL to fix this.

Signed-off-by: Ankit Khushwaha <redacted>
---
changelog:
v2:
change patch name to net-next.

v1:
https://lore.kernel.org/all/20251124161324.16901-1-ankitkhushwaha.linux@gmail.com/ (local)
---
 tools/testing/selftests/net/so_txtime.c   | 2 +-
 tools/testing/selftests/net/txtimestamp.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/net/so_txtime.c b/tools/testing/selftests/net/so_txtime.c
index 8457b7ccbc09..b76df1efc2ef 100644
--- a/tools/testing/selftests/net/so_txtime.c
+++ b/tools/testing/selftests/net/so_txtime.c

@@ -174,7 +174,7 @@ static int do_recv_errqueue_timeout(int fdt)
 	msg.msg_controllen = sizeof(control);

 	while (1) {
-		const char *reason;
+		const char *reason = NULL;

 		ret = recvmsg(fdt, &msg, MSG_ERRQUEUE);
 		if (ret == -1 && errno == EAGAIN)

diff --git a/tools/testing/selftests/net/txtimestamp.c b/tools/testing/selftests/net/txtimestamp.c
index dae91eb97d69..bcc14688661d 100644
--- a/tools/testing/selftests/net/txtimestamp.c
+++ b/tools/testing/selftests/net/txtimestamp.c

@@ -217,7 +217,7 @@ static void print_timestamp_usr(void)
 static void print_timestamp(struct scm_timestamping *tss, int tstype,
 			    int tskey, int payload_len)
 {
-	const char *tsname;
+	const char *tsname = NULL;

 	validate_key(tskey, tstype);

--

2.52.0