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[cc1] Simplify popctx()

This new version removed some indentation and does a better use
of the whitespaces.

--- a/cc1/symbol.c

+++ b/cc1/symbol.c

@@ -106,23 +106,25 @@

 {

 	Symbol *next, *sym;

-	if (--curctx == GLOBALCTX) {

-		for (sym = labels; sym; sym = next) {

-			next = sym->next;

-			killsym(sym);

-		}

-		labels = NULL;

-		if (curfun) {

-			free(curfun->u.pars);

-			curfun->u.pars = NULL;

-		}

-	}

-

 	for (sym = head; sym && sym->ctx > curctx; sym = next) {

 		next = sym->next;

 		killsym(sym);

 	}

 	head = sym;

+

+	if (--curctx != GLOBALCTX)

+		return;

+

+	for (sym = labels; sym; sym = next) {

+		next = sym->next;

+		killsym(sym);

+	}

+	labels = NULL;

+

+	if (curfun) {

+		free(curfun->u.pars);

+		curfun->u.pars = NULL;

+	}

 }

 unsigned