peek(1): warn on pledge(2) or unveil(2) errors

src/peek.c

@@ -62,8 +62,11 @@ usage(char *argv0) {
 
 int main(int argc, char *argv[]){
 #ifdef __OpenBSD__
-	pledge("stdio tty unveil", NULL);
-	unveil(NULL, NULL);
+	if (pledge("stdio tty unveil", "") != 0 || unveil(NULL, NULL) != 0) {
+		/* This isn't fatal; these return values could be cast to void just as
+		 * easily. */
+		(void)perror(argv[0] == NULL ? argv[0] : program_name);
+	}
 #endif
 
 	if (argc > 0) { /* option parsing */