update request count

src/cmd/troff/tdef.h

diff --git a/src/cmd/troff/tdef.h b/src/cmd/troff/tdef.h
index 0b3f2b1..5b4bbf5 100644
--- a/src/cmd/troff/tdef.h
+++ b/src/cmd/troff/tdef.h
@@ -163,7 +163,7 @@
 /* array sizes, and similar limits: */
 
 #define MAXFONTS 99	/* Maximum number of fonts in fontab */
-#define	NM	90	/* requests + macros */
+#define	NM	91	/* requests + macros */
 #define	NN	NNAMES	/* number registers */
 #define	NNAMES	15	/* predefined reg names */
 #define	NIF	15	/* if-else nesting */