Check error code of fork(2).

Index: conformance/interfaces/sigqueue/1-1.c
--- conformance/interfaces/sigqueue/1-1.c.orig
+++ conformance/interfaces/sigqueue/1-1.c
@@ -40,7 +40,11 @@ int main()
 {
 	int pid;
 
-	if ((pid = fork()) == 0) {
+	pid = fork();
+	if (pid == -1) {
+		perror("fork");
+		return PTS_UNRESOLVED;
+	} else if (pid == 0) {
 		/* child here */
 		struct sigaction act;
 		act.sa_flags=SA_SIGINFO;
