forward-ported 6.14 to 6.20 patch from Debian

--- tcsh-6.20.00/tw.color.c
+++ tcsh-6.20.00/tw.color.c
@@ -382,13 +382,10 @@
 			if ((Char)variables[i].variable[0] == (v[0] & CHAR) &&
 			    (Char)variables[i].variable[1] == (v[1] & CHAR))
 			    break;
-		    if (i < nvariables) {
-			v += 3;
+		    v += 3;
+		    if (i < nvariables)
 			getstring(&c, &v, &variables[i].color, ':');
-			continue;
-		    }
-		    else
-			stderror(ERR_BADCOLORVAR, v[0], v[1]);
+		    continue;
 		}
 		break;
 	    }