[hackers] [sbase] Fix segmentation fault in tr(1) with -dc and one set || FRIGN

[git]

commit d5d8d3a70c94b9e61c2722b20aaf411334680f2a
Author: FRIGN <d...@frign.de>
Date:   Mon Feb 2 17:57:46 2015 +0100

    Fix segmentation fault in tr(1) with -dc and one set

diff --git a/tr.c b/tr.c
index 2ac5bd1..352a862 100644
--- a/tr.c
+++ b/tr.c
@@ -208,8 +208,12 @@ read:
        off1 = off2 = 0;
        for (i = 0; i < set1ranges; i++) {
                if (set1[i].start <= r && r <= set1[i].end) {
-                       if (dflag && !cflag)
-                               goto read;
+                       if (dflag) {
+                               if (cflag)
+                                       goto write;
+                               else
+                                       goto read;
+                       }
                        if (sflag) {
                                if (r == lastrune)
                                        goto read;
@@ -237,8 +241,11 @@ read:
                }
        }
        if (set1check && set1check((wint_t)r)) {
-               if (dflag && !cflag)
-                       goto read;
+               if (dflag)
+                       if (cflag)
+                               goto write;
+                       else
+                               goto read;
                if (sflag) {
                        if (r == lastrune)
                                goto read;