[PATCH net-next 10/11] selftests: mptcp: fix const qualifier warnings in strchr usage

From: Geliang Tang <redacted>

In mptcp_connect.c, strchr() returns a pointer to a character within
the input string, which is declared as const char *. Assigning this
return value to a non-const char * discards the const qualifier,
triggering compiler warnings:

 make: Entering directory 'tools/testing/selftests/net/mptcp'
   CC       mptcp_connect
 mptcp_connect.c: In function 'parse_cmsg_types':
 mptcp_connect.c:1267:22: warning: initialization discards 'const'
	qualifier from pointer target type [-Wdiscarded-qualifiers]
  1267 |         char *next = strchr(type, ',');
       |                      ^~~~~~
 mptcp_connect.c: In function 'parse_setsock_options':
 mptcp_connect.c:1295:22: warning: initialization discards 'const'
	qualifier from pointer target type [-Wdiscarded-qualifiers]
  1295 |         char *next = strchr(name, ',');
       |                      ^~~~~~
 make: Leaving directory 'tools/testing/selftests/net/mptcp'

Fix these warnings by declaring the 'next' variable as const char *,
as it is only used for read-only parsing.

Signed-off-by: Geliang Tang <redacted>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
To: Shuah Khan <shuah@kernel.org>
Cc: linux-kselftest@vger.kernel.org
---
 tools/testing/selftests/net/mptcp/mptcp_connect.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.c b/tools/testing/selftests/net/mptcp/mptcp_connect.c
index cbe573c4ab3a..ea4cb6c1bd5e 100644
--- a/tools/testing/selftests/net/mptcp/mptcp_connect.c
+++ b/tools/testing/selftests/net/mptcp/mptcp_connect.c

@@ -1264,7 +1264,7 @@ static void apply_cmsg_types(int fd, const struct cfg_cmsg_types *cmsg)
 
 static void parse_cmsg_types(const char *type)
 {
-	char *next = strchr(type, ',');
+	const char *next = strchr(type, ',');
 	unsigned int len = 0;
 
 	cfg_cmsg_types.cmsg_enabled = 1;

@@ -1292,7 +1292,7 @@ static void parse_cmsg_types(const char *type)
 
 static void parse_setsock_options(const char *name)
 {
-	char *next = strchr(name, ',');
+	const char *next = strchr(name, ',');
 	unsigned int len = 0;
 
 	if (next) {

-- 
2.53.0