fix: Use const references to avoid unnecessary variable copying

This commit addresses cppcheck warnings about variables that can be
declared as const references (constVariableReference). These variables
were being copied unnecessarily when they could be accessed as const
references, improving performance and code clarity.

Fixed files:
- kms++util/src/cpuframebuffer.cpp: Make plane reference const in destructor
- kms++util/src/testpat.cpp: Make info and lambda parameter const references
- utils/kmstest.cpp: Make loop variable const reference in output parsing

1 files changed, 1 insertions, 1 deletions

diff --git a/utils/kmstest.cpp b/utils/kmstest.cpp
index 5028e7e..8340fa7 100644
--- a/utils/kmstest.cpp
+++ b/utils/kmstest.cpp
@@ -572,7 +572,7 @@ static vector<OutputInfo> setups_to_outputs(Card& card, ResourceManager& resman,
 	OutputInfo* current_output = 0;
 	PlaneInfo* current_plane = 0;
 
-	for (auto& arg : output_args) {
+	for (const auto& arg : output_args) {
 		switch (arg.type) {
 		case ArgType::Connector: {
 			outputs.push_back(OutputInfo{});