Correct some mistkaes picked up by static analysis.

Thanks to seo for pointing these out.

src/cwc.c

@@ -1857,7 +1857,8 @@ cwc_emm_cryptoworks(cwc_t *cwc, uint8_t *data, int len)
         cwc_send_msg(cwc, composed, elen + 12, 0, 1);
         free(composed);
         free(tmp);
-      }
+      } else if (tmp)
+        free(tmp);
       cwc->cwc_cryptoworks_emm.shared_emm = NULL;
       cwc->cwc_cryptoworks_emm.shared_len = 0;
     }

src/dvb/dvb_adapter.c

@@ -520,6 +520,7 @@ tda_add(int adapter_num)
   dirp = opendir(path);
   if (!dirp)
     return;
+  closedir(dirp);
 
   /* Check each frontend */
   // Note: this algo will fail if there are really exotic variations

src/main.c

@@ -283,6 +283,7 @@ show_usage
         }
         tok = strtok(NULL, "\n");
       }
+      free(desc);
     }
   }
   printf("\n");