this appears to fix the bug of cb dropping the character
after a colon.

Reference: /n/sources/patch/applied/cb-colon-drops-next-char
Date: Fri Oct 28 04:47:56 CES 2005

--- /sys/src/cmd/cb/cb.c	Fri Oct 28 04:47:18 2005
+++ /sys/src/cmd/cb/cb.c	Fri Oct 28 04:47:14 2005
@@ -52,11 +52,11 @@
 	exits(0);
 }
 void
-work(void){
-	int c;
+work(void)
+{
+	int c, cc;
 	struct keyw *lptr;
 	char *pt;
-	char cc;
 	int ct;
 
 	while ((c = getch()) != Beof){
@@ -471,6 +471,7 @@
 				putch(cc,NO);
 				continue;
 			}
+			unget(cc);
 			if (question == 1){
 				question = 0;
 				gotop(c);