CLN: fix build warning

Author: pilkibun

pandas/_libs/hashtable_class_helper.pxi.in

@@ -424,8 +424,13 @@ cdef class {{name}}HashTable(HashTable):
             for i in range(n):
                 val = values[i]
 
-                if ignore_na and (val != val
-                                  or (use_na_value and val == na_value2)):
+                if ignore_na and (
+                {{if name.lower().startswith(("uint", "int"))}}
+                0
+                {{else}}
+                val != val or (use_na_value and val == na_value2)
+                {{endif}}
+                ):
                     # if missing values do not count as unique values (i.e. if
                     # ignore_na is True), skip the hashtable entry for them,
                     # and replace the corresponding label with na_sentinel
@@ -1020,8 +1025,13 @@ cdef class PyObjectHashTable(HashTable):
             val = values[i]
             hash(val)
 
-            if ignore_na and ((val != val or val is None)
-                              or (use_na_value and val == na_value)):
+            if ignore_na and (
+                {{if name.lower().startswith(("uint", "int"))}}
+                0
+                {{else}}
+                (val != val or val is None)
+                              or (use_na_value and val == na_value)
+                {{endif}}):
                 # if missing values do not count as unique values (i.e. if
                 # ignore_na is True), skip the hashtable entry for them, and
                 # replace the corresponding label with na_sentinel