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[as] Allow instructions without arguments

In that case the argument string is NULL and as was segfaulting.

--- a/as/main.c

+++ b/as/main.c

@@ -63,7 +63,7 @@

 	Arg *ap;

 	static Arg args[NARGS];

-	for (ap = args; ; ++ap) {

+	for (ap = args; s; ++ap) {

 		while (isspace(*s))

 			++s;

 		if (*s == '\0')

--- a/as/target/x86/gen.awk

+++ b/as/target/x86/gen.awk

@@ -72,7 +72,7 @@

 		a = substr(a, RLENGTH+1)

 		if (a ~ /^\+$/) {

 			return out "|AREP"

-		} else {

+		} else if (a != "") {

 			print "wrong arg", a

 			exit 1

 		}