Fix some indentation

tools/assimp_cmd/Main.cpp

@@ -291,8 +291,8 @@ const aiScene* ImportModel(
 	// Now validate this flag combination
 	if(!globalImporter->ValidateFlags(imp.ppFlags)) {
 		printf("ERROR: Unsupported post-processing flags \n");
-        return nullptr;
-    }
+		return nullptr;
+	}
 	printf("Validating postprocessing flags ...  OK\n");
 	if (imp.showLog) {
 		PrintHorBar();
@@ -311,8 +311,8 @@ const aiScene* ImportModel(
 	}
 	if (!scene) {
 		printf("ERROR: Failed to load file: %s\n", globalImporter->GetErrorString());
-        return nullptr;
-    }
+		return nullptr;
+	}
 
 	const clock_t second = ::clock();
 	const double seconds = static_cast<double>(second-first) / CLOCKS_PER_SEC;