ipa: rpi: imx500: Fix stringop-truncation warning

This warning is issued by the compiler because the strncpy copies across
the whole string array, leaving no place for the nul terminator. Fix it
by copying sizeof(str) - 1 elements.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>

Author: naushir

src/ipa/rpi/cam_helper/cam_helper_imx500.cpp

@@ -246,7 +246,7 @@ void CamHelperImx500::parseInferenceData(libcamera::Span<const uint8_t> buffer,
 				exported.height = inputTensorInfo.height;
 				exported.numChannels = inputTensorInfo.channels;
 				strncpy(exported.networkName, inputTensorInfo.networkName.c_str(),
-					sizeof(exported.networkName));
+					sizeof(exported.networkName) - 1);
 				exported.networkName[sizeof(exported.networkName) - 1] = '\0';
 				metadata.set("cnn.input_tensor_info", exported);
 				metadata.set("cnn.input_tensor", std::move(inputTensorInfo.data));
@@ -279,7 +279,7 @@ void CamHelperImx500::parseInferenceData(libcamera::Span<const uint8_t> buffer,
 					<< "IMX500 output tensor info export failed, numTensors > MaxNumTensors";
 			}
 			strncpy(exported.networkName, outputTensorInfo.networkName.c_str(),
-				sizeof(exported.networkName));
+				sizeof(exported.networkName) - 1);
 			exported.networkName[sizeof(exported.networkName) - 1] = '\0';
 			metadata.set("cnn.output_tensor_info", exported);
 			metadata.set("cnn.output_tensor", std::move(outputTensorInfo.data));