fix build when SCHED_SPORADIC is defined (closes #20217)

Misc/NEWS

@@ -43,6 +43,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #20217: Fix build in SCHED_SPORADIC is defined.
+
 - Issue #13107: argparse and optparse no longer raises an exception when output
   a help on environment with too small COLUMNS.  Based on patch by
   Elazar Gershuni.

Modules/posixmodule.c

@@ -11863,7 +11863,7 @@ all_ins(PyObject *d)
     if (ins(d, "SCHED_FIFO", (long)SCHED_FIFO)) return -1;
     if (ins(d, "SCHED_RR", (long)SCHED_RR)) return -1;
 #ifdef SCHED_SPORADIC
-    if (ins(d, "SCHED_SPORADIC", (long)SCHED_SPORADIC) return -1;
+    if (ins(d, "SCHED_SPORADIC", (long)SCHED_SPORADIC)) return -1;
 #endif
 #ifdef SCHED_BATCH
     if (ins(d, "SCHED_BATCH", (long)SCHED_BATCH)) return -1;