selftests:proc-empty-vm: Remove unused debug write callIn the function test_proc_pid_statm

From: angquan yu <[email protected]>

In tools/testing/selftests/proc/proc-empty->because the return value of a write call was being ignored. This call was partof a conditional debugging block (if (0) { ... }), which meant it would neveractually execute.

This patch removes the unused debug write call. This cleanup resolves the compi>warning about ignoring the result of write declared with the warn_unused_resultattribute.

Removing this code also improves the clarity and maintainability ofthe function, as it eliminates a non-functional block of code.

This is original warning: proc-empty-vm.c: In function ‘test_proc_pid_statm’:proc-empty-vm.c:385:17: warning: ignoring return value of ‘write’ declared with>385 | write(1, buf, rv);|

---
 tools/testing/selftests/proc/proc-empty-vm.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

index 56198d4ca..74ef8627f 100644
@@ -382,7 +382,10 @@ static int test_proc_pid_statm(pid_t pid)
 	assert(rv >= 0);
 	assert(rv <= sizeof(buf));
 	if (0) {
-		write(1, buf, rv);
+		ssize_t written = write(1, buf, rv);
+		if (written == -1) {
+			perror("write failed /proc/${pid}");
+		}
 	}
 
 	const char *p = buf;

2.39.2