[PATCH i-g-t v2 1/5] benchmarks/gem_wsim: Preserve const qualifiers

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

With glibc 2.43, strchr() on const input returns a const pointer.
Storing that result in char * causes a discarded-qualifier warning
in str_to_engine().

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

  ../benchmarks/gem_wsim.c: In function 'str_to_engine':
  ../benchmarks/gem_wsim.c:590:27: warning:
    initialization discards 'const' qualifier from pointer target type
    [-Wdiscarded-qualifiers]

Use const char * for the engine separator, which is only read.

Assisted-by: Copilot:GPT-6-Astra
Signed-off-by: Alex Hung <alex.hung@amd.com>
---
 benchmarks/gem_wsim.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/benchmarks/gem_wsim.c b/benchmarks/gem_wsim.c
index 1a4139279..8cdf940f9 100644
--- a/benchmarks/gem_wsim.c
+++ b/benchmarks/gem_wsim.c
@@ -587,7 +587,7 @@ static intel_engine_t str_to_engine(const char *str)
 	}
 
 	if (str[pos]) {
-		char *s = strchr(&str[pos], '-');
+		const char *s = strchr(&str[pos], '-');
 		char *endptr = NULL;
 		long id;
 
-- 
2.53.0