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ren: use a negative value for undefined ren_f

Otherwise it fails for zero \n(.f, the temporary font position.

--- a/ren.c

+++ b/ren.c

@@ -20,8 +20,8 @@

 };

 static struct div divs[NPREV];	/* diversion stack */

 static struct div *cdiv;	/* current diversion */

-static int ren_f;		/* last rendered n_f */

-static int ren_s;		/* last rendered n_s */

+static int ren_f = -1;		/* last rendered n_f */

+static int ren_s = -1;		/* last rendered n_s */

 static int ren_div;		/* rendering a diversion */

 static int ren_backed = -1;	/* pushed back character */

@@ -53,8 +53,8 @@

 		if (args[0][2] == 'a' && str_get(cdiv->reg))	/* .da */

 			sbuf_append(&cdiv->sbuf, str_get(cdiv->reg));

 		sbuf_append(&cdiv->sbuf, DIV_BEG "\n");

-		ren_f = 0;

-		ren_s = 0;

+		ren_f = -1;

+		ren_s = -1;

 		cdiv->prev_d = n_d;

 		cdiv->prev_h = n_h;

 		cdiv->prev_mk = n_mk;

@@ -75,8 +75,8 @@

 		n_mk = cdiv->prev_mk;

 		n_ns = cdiv->prev_ns;

 		cdiv = cdiv > divs ? cdiv - 1 : NULL;

-		ren_f = 0;

-		ren_s = 0;

+		ren_f = -1;

+		ren_s = -1;

 	}

 }

@@ -575,8 +575,8 @@

 		c = next();

 	}

 	odiv_end();

-	ren_f = 0;

-	ren_s = 0;

+	ren_f = -1;

+	ren_s = -1;

 	n = adj_wid(adj);

 	n_ct = type;

 	adj_free(adj);