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cc2: Fix popctx()

The list of locals was not created correctly and only the first
local was freed() but the hashtable was modified like if all
the symbols were freed.

--- a/src/cmd/cc/cc2/symbol.c

+++ b/src/cmd/cc/cc2/symbol.c

@@ -11,7 +11,7 @@

 Symbol *locals;

-static Symbol *symtab[NR_SYMHASH], *curlocal;

+static Symbol *symtab[NR_SYMHASH];

 static int infunction;

@@ -51,7 +51,7 @@

 			symtab[sym->id & NR_SYMHASH-1] = sym->h_next;

 		freesym(sym);

 	}

-	curlocal = locals = NULL;

+	locals = NULL;

 }

 Symbol *

@@ -74,11 +74,8 @@

 	sym = xcalloc(1, sizeof(*sym));

 	sym->id = id;

 	if (infunction) {

-		if (!locals)

-			locals = sym;

-		if (curlocal)

-			curlocal->next = sym;

-		curlocal = sym;

+		sym->next = locals;

+		locals = sym;

 	}

 	if (id != TMPSYM) {

 		sym->h_next = *htab;