Fix some memory leaks

src/modules/cpu.c

@@ -48,4 +48,6 @@ void ffPrintCPU(FFinstance* instance)
         {FF_FORMAT_ARG_TYPE_DOUBLE, &cpu->frequencyMax},
         {FF_FORMAT_ARG_TYPE_DOUBLE, &cpu->temperature}
     });
+
+    ffStrbufDestroy(&output);
 }

src/modules/host.c

@@ -50,4 +50,6 @@ void ffPrintHost(FFinstance* instance)
         {FF_FORMAT_ARG_TYPE_STRBUF, &host->chassisVersion},
         {FF_FORMAT_ARG_TYPE_STRBUF, &host->sysVendor}
     });
+
+    ffStrbufDestroy(&output);
 }

src/modules/player.c

@@ -66,4 +66,6 @@ void ffPrintPlayer(FFinstance* instance)
             {FF_FORMAT_ARG_TYPE_STRBUF, &media->url}
         });
     }
+
+    ffStrbufDestroy(&playerPretty);
 }

src/modules/song.c

@@ -100,4 +100,6 @@ void ffPrintSong(FFinstance* instance)
             {FF_FORMAT_ARG_TYPE_STRBUF, &media->album}
         });
     }
+
+    ffStrbufDestroy(&songPretty);
 }