libcamera: ipa_module: prevent uninitialised access

The IPAModule::loadIPAModuleInfo() function includes a *data pointer
which is used as a null-pointer comparison in the error path with a
conditional statement of "if (ret || !data)".

The data variable is not initialised, and a single error path evaluates
this as "if (true || uninitialised)".

Whilst this error path does not incorrectly utilise the uninitialised
data, as the ret evaluates to true already, it does leave a statement
which includes an uninitialised variable.

Help the static analysers by initialising the data variable when it is
defined.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/ipa_module.cpp

@@ -291,7 +291,7 @@ int IPAModule::loadIPAModuleInfo()
 		return ret;
 	}
 
-	void *data;
+	void *data = nullptr;
 	size_t dataSize;
 	void *map;
 	size_t soSize;