Handle null argv in `switch.c`

src/switch.c

@@ -1053,7 +1053,7 @@ int main(int argc, char *argv[])
 			setrlimit(RLIMIT_STACK, &rlp);
 
 			apr_terminate();
-			ret = (int) execv(argv[0], argv);
+			if (argv) ret = (int) execv(argv[0], argv);
 
 			for (i = 0; i < argc; i++) {
 				switch_snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%s ", argv[i]);
@@ -1215,7 +1215,7 @@ int main(int argc, char *argv[])
 		int j = 0;
 
 		switch_sleep(1000000);
-		if (execv(argv[0], argv) == -1) {
+		if (!argv || execv(argv[0], argv) == -1) {
 			fprintf(stderr, "Restart Failed [%s] resorting to plan b\n", strerror(errno));
 			for (j = 0; j < argc; j++) {
 				switch_snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%s ", argv[j]);