Packages (Linux): try fixing nix-user detection

Fix #937

Author: CarterLi

src/detection/packages/packages_linux.c

@@ -510,30 +510,28 @@ void ffDetectPackagesImpl(FFPackagesResult* result, FFPackagesOptions* options)
         ffStrbufAppendS(&profilePath, ".nix-profile");
         if (ffPathExists(profilePath.chars, FF_PATHTYPE_DIRECTORY))
         {
-            result->nixUser = getNixPackages(&baseDir, ".nix-profile");
+            result->nixUser += getNixPackages(&baseDir, ".nix-profile");
         }
+
         // check if $XDG_STATE_HOME/nix/profile exists
+        FF_STRBUF_AUTO_DESTROY stateDir = ffStrbufCreate();
+        const char* stateHome = getenv("XDG_STATE_HOME");
+        if(ffStrSet(stateHome))
+        {
+            ffStrbufSetS(&stateDir, stateHome);
+            ffStrbufEnsureEndsWithC(&stateDir, '/');
+        }
         else
         {
-            FF_STRBUF_AUTO_DESTROY stateDir = ffStrbufCreate();
-            const char* stateHome = getenv("XDG_STATE_HOME");
-            if(ffStrSet(stateHome))
-            {
-                ffStrbufSetS(&stateDir, stateHome);
-                ffStrbufEnsureEndsWithC(&stateDir, '/');
-            }
-            else
-            {
-                ffStrbufSet(&stateDir, &instance.state.platform.homeDir);
-                ffStrbufAppendS(&stateDir, ".local/state/");
-            }
- 
-            ffStrbufSet(&profilePath, &stateDir);
-            ffStrbufAppendS(&profilePath, "nix/profile");
-            result->nixUser = getNixPackages(&stateDir, "nix/profile");
+            ffStrbufSet(&stateDir, &instance.state.platform.homeDir);
+            ffStrbufAppendS(&stateDir, ".local/state/");
         }
+
+        ffStrbufSet(&profilePath, &stateDir);
+        ffStrbufAppendS(&profilePath, "nix/profile");
+        result->nixUser += getNixPackages(&stateDir, "nix/profile");
     }
- 
+
     if (!(options->disabled & FF_PACKAGES_FLAG_FLATPAK_BIT))
         result->flatpakUser = getFlatpak(&baseDir, "/.local/share/flatpak");
 }