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 <[e-mail]>
Reviewed-by: Shuah Khan <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/vm/ksm_tests.c

···
 	}
 	if (fprintf(f, "%lu", val) < 0) {
 		perror("fprintf");
+		fclose(f);
 		return 1;
 	}
 	fclose(f);
···
 	}
 	if (fscanf(f, "%lu", val) != 1) {
 		perror("fscanf");
+		fclose(f);
 		return 1;
 	}
 	fclose(f);