selftests: vm: Fix resource leak when return error

When return on an error path, file handle need to be closed
to prevent resource leak

Signed-off-by: Ding Xiang <dingxiang@cmss.chinamobile.com>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

Author: Ding Xiang

tools/testing/selftests/vm/ksm_tests.c

@@ -54,6 +54,7 @@ static int ksm_write_sysfs(const char *file_path, unsigned long val)
 	}
 	if (fprintf(f, "%lu", val) < 0) {
 		perror("fprintf");
+		fclose(f);
 		return 1;
 	}
 	fclose(f);
@@ -72,6 +73,7 @@ static int ksm_read_sysfs(const char *file_path, unsigned long *val)
 	}
 	if (fscanf(f, "%lu", val) != 1) {
 		perror("fscanf");
+		fclose(f);
 		return 1;
 	}
 	fclose(f);