The (i < PROMPTLEN - 1) test added by r300442 in the code for the default

case of \c in the prompt format string is a no-op.  We already passed
this test at the top of the loop, and i has not yet been incremented in
this path.  Change this test to (i < PROMPTLEN - 2).

Reported by:	Coverity
CID:		1008328
Reviewed by:	cem
MFC after:	1 week

bin/sh/parser.c

@@ -2063,7 +2063,7 @@ getprompt(void *unused __unused)
 				 */
 			default:
 				ps[i] = '\\';
-				if (i < PROMPTLEN - 1)
+				if (i < PROMPTLEN - 2)
 					ps[++i] = *fmt;
 				break;
 			}