[PATCH i-g-t v2 4/5] tests/i915_pm_sseu: Preserve const qualifiers

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

With glibc 2.43, strstr() on const input returns a const pointer.
Storing that result in char * discards const and causes compiler
warnings in the SSEU debugfs parser.

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

  ../tests/intel/i915_pm_sseu.c: In function 'dbg_has_line':
  ../tests/intel/i915_pm_sseu.c:123:21: warning:
    initialization discards 'const' qualifier from pointer target type
    [-Wdiscarded-qualifiers]

Use const char * for the read-only search results. Pass NULL for
the unused strtol() end pointer so the input pointer can remain const.

Assisted-by: Copilot:GPT-6-Astra
Signed-off-by: Alex Hung <alex.hung@amd.com>
---
 tests/intel/i915_pm_sseu.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tests/intel/i915_pm_sseu.c b/tests/intel/i915_pm_sseu.c
index 5dd571a45..a4b92791c 100644
--- a/tests/intel/i915_pm_sseu.c
+++ b/tests/intel/i915_pm_sseu.c
@@ -120,7 +120,7 @@ dbg_get_status_section(const char *title, char **first, char **last)
 static bool
 dbg_has_line(const char *first, const char *last, const char *name)
 {
-	char *pos = strstr(first, name);
+	const char *pos = strstr(first, name);
 
 	return pos != NULL && pos < last;
 }
@@ -128,7 +128,7 @@ dbg_has_line(const char *first, const char *last, const char *name)
 static int
 dbg_get_int(const char *first, const char *last, const char *name)
 {
-	char *pos;
+	const char *pos;
 
 	pos = strstr(first, name);
 	igt_assert(pos != NULL);
@@ -137,13 +137,13 @@ dbg_get_int(const char *first, const char *last, const char *name)
 	pos += 2;
 	igt_assert(pos != last);
 
-	return strtol(pos, &pos, 10);
+	return strtol(pos, NULL, 10);
 }
 
 static bool
 dbg_get_bool(const char *first, const char *last, const char *name)
 {
-	char *pos;
+	const char *pos;
 
 	pos = strstr(first, name);
 	igt_assert(pos != NULL);
-- 
2.53.0