Apply suggestions from code review

Co-authored-by: Phillip Cloud <[email protected]>

Author: brandon-b-miller

numba_cuda/numba/cuda/cpython/listobj.py

@@ -304,7 +304,7 @@ def define_dtor(self):
         else:
             dtypestr = str(self.dtype)
         fn = cgutils.get_or_insert_function(
-            mod, fnty, "numba_cuda_dtor_list_{}".format(dtypestr)
+            mod, fnty, f"numba_cuda_dtor_list_{dtypestr}"
         )
         if not fn.is_declaration:
             # End early if the dtor is already defined

numba_cuda/numba/cuda/memory_management/nrt.cu

@@ -91,13 +91,12 @@ nrt_varsize_dtor(void *ptr, size_t size, void *info) {
 
 __device__ NRT_MemInfo* NRT_MemInfo_new_varsize(size_t size)
 {
-    NRT_MemInfo *mi = NULL;
     void *data = NRT_Allocate(size);
     if (data == NULL) {
         return NULL; /* return early as allocation failed */
     }
 
-    mi = NRT_MemInfo_new(data, size, nrt_varsize_dtor, NULL);
+    NRT_MemInfo *mi = NRT_MemInfo_new(data, size, nrt_varsize_dtor, NULL);
 
     return mi;
 }