elm quicklaunch binary - fix possible 0 termination issue with strings

the input strings for agrs/env could be not 0 terminated tho the
sender guarantees it. ensure they are by 0'ing the last byte

fix CID 1353607

src/bin/elementary/quicklaunch.c

@@ -114,6 +114,7 @@ handle_run(int fd, unsigned long bytes)
         return;
      }
    close(fd);
+   if (bytes > 0) buf[bytes - 1] = 0;
 
    argc = ((unsigned long *)(buf))[0];
    envnum = ((unsigned long *)(buf))[1];