I wouldn't say so, Radagast did not know that Saruman had turned evil, all he knew is that Saruman wanted to see Gandalf, Saruman is a persuasive talker after all. Gandalf said if he had sensed something wrong with Radagast he wouldn't have gone, or would have went to Orthanc more warily, so Radagast was just relaying a message, wasn't trying to get Gandalf killed.
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