Check error code of fork(2).

Index: conformance/interfaces/sigaction/11-1.c
--- conformance/interfaces/sigaction/11-1.c.orig
+++ conformance/interfaces/sigaction/11-1.c
@@ -51,7 +51,11 @@ int main()
 	sigemptyset(&act.sa_mask);
 	sigaction(SIGCHLD,  &act, 0);     
 
-	if ((pid = fork()) == 0) {
+	pid = fork();
+	if (pid == -1) {
+		perror("fork");
+		return PTS_UNRESOLVED;
+	} else if (pid == 0) {
 		/* child */
 		while(1) {
 			/* wait forever, or until we are 
