typo fix - calculate_sigmas_scheduler (#2619)

self.scheduler -> scheduler_name
Co-authored-by: Lt.Dr.Data <lt.dr.data@gmail.com>

comfy/samplers.py

@@ -639,7 +639,7 @@ def calculate_sigmas_scheduler(model, scheduler_name, steps):
     elif scheduler_name == "sgm_uniform":
         sigmas = normal_scheduler(model, steps, sgm=True)
     else:
-        print("error invalid scheduler", self.scheduler)
+        print("error invalid scheduler", scheduler_name)
     return sigmas
 
 def sampler_object(name):