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kb.c: add curly braces to enable usb mouse nub scrolling

--- a/sys/src/cmd/nusb/kb/kb.c

+++ b/sys/src/cmd/nusb/kb/kb.c

@@ -264,10 +264,12 @@

 			y = buf[2];

 		}

 		b = maptab[buf[0] & 0x7];

-		if(c > 3 && buf[3] == 1)	/* up */

+		if(c > 3 && buf[3] > 0){	/* up */

 			b |= 0x08;

-		if(c > 3 && buf[3] == -1)	/* down */

+		}

+		if(c > 3 && buf[3] < 0){	/* down */

 			b |= 0x10;

+		}

 		if(kbdebug > 1)

 			fprint(2, "%s: m%11d %11d %11d\n", argv0, x, y, b);

 		seprint(mbuf, mbuf+sizeof(mbuf), "m%11d %11d %11d", x, y,b);