[PATCH i-g-t v2 5/5] tests/msm_mapping: Keep parser buffers writable

[Alex Hung <alex.hung@amd.com>]

With glibc 2.43, strstr() on const input returns a const pointer.
Assigning that result to char * in endswith() discards const and
causes a compiler warning.

The following warning is observed on Ubuntu 26.04 (wrapped):

  ../tests/msm/msm_mapping.c: In function 'endswith':
  ../tests/msm/msm_mapping.c:128:19: warning:
    initialization discards 'const' qualifier from pointer target type
    [-Wdiscarded-qualifiers]

Keep the get_line() return value, line pointer and endswith() input
writable because endswith() modifies the buffer. This preserves
mutable access through the parser without casting away const.

Assisted-by: Copilot:GPT-6-Astra
Signed-off-by: Alex Hung <alex.hung@amd.com>
---
 tests/msm/msm_mapping.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tests/msm/msm_mapping.c b/tests/msm/msm_mapping.c
index 05960627c..52b494abf 100644
--- a/tests/msm/msm_mapping.c
+++ b/tests/msm/msm_mapping.c
@@ -102,7 +102,7 @@ wait_for_stall_on_fault(int drm_fd)
  * Helper to find named buffer address
  */
 
-static const char *
+static char *
 get_line(char **buf)
 {
 	char *ret, *eol;
@@ -123,7 +123,7 @@ get_line(char **buf)
 }
 
 static bool
-endswith(const char *str, const char *end)
+endswith(char *str, const char *end)
 {
 	char *p = strstr(str, end);
 
@@ -166,7 +166,7 @@ get_bo_addr(int drm_fd, const char *name)
 	 */
 
 	while (*p) {
-		const char *line = get_line(&p);
+		char *line = get_line(&p);
 
 		if (endswith(line, name)) {
 			uint64_t addr, dummy;
-- 
2.53.0