hide fan speed from hwmon output if not detected

docs/credits.txt

@@ -22,7 +22,7 @@ Gabriele "matrix" Gristina <matrix@hashcat.net> (@gm4tr1x)
 * Compressed wordlist feature
 * OpenCL Info feature
 * Apple macOS port
-* Hardware monitor initial code base
+* Hardware monitor initial code base and maintenance
 * Test suite initial code base
 * Makefile initial code base
 * Multithreading initial code base

src/ext_iokit.c

@@ -270,7 +270,7 @@ int hm_IOKIT_get_fan_speed_current (void *hashcat_ctx, char *fan_speed_buf)
 
     // remove last two bytes
     size_t out_len = strlen (fan_speed_buf);
-    fan_speed_buf[out_len-2] = '\0';
+    if (out_len > 2) fan_speed_buf[out_len-2] = '\0';
   }
 
   return 1;

src/hwmon.c

@@ -1408,13 +1408,6 @@ int hwmon_ctx_init (hashcat_ctx_t *hashcat_ctx)
 
       hwmon_ctx->hm_iokit = NULL;
     }
-
-    if (hwmon_ctx->hm_adl)
-    {
-      hcfree (hwmon_ctx->hm_iokit);
-
-      hwmon_ctx->hm_iokit = NULL;
-    }
   }
   #endif
 

src/terminal.c

@@ -1796,7 +1796,7 @@ void status_display (hashcat_ctx_t *hashcat_ctx)
       if (device_info->hwmon_dev == NULL) continue;
 
       #if defined(__APPLE__)
-      if (first_dev && device_info->hwmon_fan_dev)
+      if (first_dev && strlen (device_info->hwmon_fan_dev) > 0)
       {
         event_log_info (hashcat_ctx, "Hardware.Mon.SMC.: %s", device_info->hwmon_fan_dev);
         first_dev = false;