fix some findings by the static analyser

boards/msba2-common/tools/src/ihex.c

@@ -92,6 +92,7 @@ int read_intel_hex(const char *filename)
         if (*buf) {
             if (parse_hex_line(buf) == 0) {
                 printf("Warning, parse error line %d\n", lineno);
+                fclose(fp);
                 return -2;
             }
         }

dist/tools/linux-border_router/testing.c

@@ -36,6 +36,8 @@ void init_file(const char *skeleton_file_name,
             fprintf(stats_file, "%s", line);
         }
     }
+
+    fclose(skeleton_file);
 }
 
 int testing_init(const char *stats_file_name,

sys/transceiver/transceiver.c

@@ -414,8 +414,8 @@ static void receive_packet(uint16_t type, uint8_t pos)
             receive_at86rf231_packet(trans_p);
 #else
             trans_p = NULL;
-        }
 #endif
+        }
         else if (type == RCV_PKT_NATIVE) {
 #ifdef MODULE_NATIVENET
             receive_nativenet_packet(trans_p);