check return value of alloc functions, from Charles Longeau

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@21745 ec53bebd-3082-4978-b11e-865c3cabbd6b

kadmin/random_password.c

@@ -123,7 +123,11 @@ generate_password(char **pw, int num_classes, ...)
     unsigned char rbuf[8]; /* random buffer */
     int rleft = 0;
 
+    *pw = NULL;
+
     classes = malloc(num_classes * sizeof(*classes));
+    if(classes == NULL)
+	return;
     va_start(ap, num_classes);
     len = 0;
     for(i = 0; i < num_classes; i++){