code style: remove space after unary "not" operator

There are no semantic changes in this commit.

Suggested-by: Mike Frysinger <vapier@gentoo.org>
See: https://github.com/OpenRC/openrc/pull/435#pullrequestreview-727035394

src/rc/start-stop-daemon.c

@@ -800,7 +800,7 @@ int main(int argc, char **argv)
 
 		if (makepidfile && pidfile) {
 			fp = fopen(pidfile, "w");
-			if (! fp)
+			if (!fp)
 				eerrorx("%s: fopen `%s': %s", applet, pidfile,
 				    strerror(errno));
 			fprintf(fp, "%d\n", mypid);