vblade, cifs, usbuhci: fix parenthesis

sys/src/9/pc/usbuhci.c

@@ -958,7 +958,7 @@ interrupt(Ureg*, void *a)
 	}
 	OUTS(Status, sts & Sall);
 	cmd = INS(Cmd);
-	if(cmd & Crun == 0){
+	if((cmd & Crun) == 0){
 		iprint("uhci %#ux: not running: uhci bug?\n", ctlr->port);
 		/* BUG: should abort everything in this case */
 	}

sys/src/cmd/cifs/main.c

@@ -550,7 +550,7 @@ smbcreateopen(Aux *a, char *path, int mode, int perm, int is_create,
 		break;
 	}
 
-	if(mode & DMEXCL == 0)
+	if((mode & DMEXCL) == 0)
 		access |= 0x10;
 	else
 		access |= 0x40;

sys/src/cmd/disk/vblade/vblade.c

@@ -398,7 +398,7 @@ serveata(Aoehdr *h, Vblade *vb, int mtu)
 		goto out;
 	}
 
-	if(a->cmdstat&0xf0 == 0x20)
+	if((a->cmdstat&0xf0) == 0x20)
 		lba &= 0xfffffff;
 	switch(a->cmdstat){
 	default: