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[as] Simplify the trailing character detection

We don't need a full check of the trailing line now, because we only
accept comments at the beginning of the line.

--- a/as/parser.c

+++ b/as/parser.c

@@ -112,12 +112,8 @@

 	if (lp->args = field(&s, &len))

 		r++;

-	if (s) {

-		while (isspace(*s))

-			++s;

-		if (*s != '\0' && *s != '/')

-			error("trailing characters at the end of the line");

-	}

+	if (s && *s && *s != '/')

+		error("trailing characters at the end of the line");

 	return r;

 }