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mothra: remove unused local variables from pl_nextc()

--- a/sys/src/cmd/mothra/rdhtml.c

+++ b/sys/src/cmd/mothra/rdhtml.c

@@ -219,8 +219,7 @@

 }

 int pl_nextc(Hglob *g){

 	int c;

-	int n;

-	Rune r;

+

 	if(g->heof) return EOF;

 	if(g->npeekc!=0) return g->peekc[--g->npeekc];

 	c=pl_readc(g);