patch 8.1.1086: too many curly braces

Problem:    Too many curly braces.
Solution:   Remove curly braces where they are not needed. (Hirohito Higashi,
            closes #3982)
diff --git a/src/if_python3.c b/src/if_python3.c
index e8ab44f..d93d633 100644
--- a/src/if_python3.c
+++ b/src/if_python3.c
@@ -1236,9 +1236,7 @@
 	      (Py_ssize_t)((BufferObject *)(self))->buf->b_ml.ml_line_count,
 	      &start, &stop,
 	      &step, &slicelen) < 0)
-	{
 	    return NULL;
-	}
 	return BufferSlice((BufferObject *)(self), start, stop);
     }
     else
@@ -1268,9 +1266,7 @@
 	      (Py_ssize_t)((BufferObject *)(self))->buf->b_ml.ml_line_count,
 	      &start, &stop,
 	      &step, &slicelen) < 0)
-	{
 	    return -1;
-	}
 	return RBAsSlice((BufferObject *)(self), start, stop, val, 1,
 			  (PyInt)((BufferObject *)(self))->buf->b_ml.ml_line_count,
 			  NULL);
@@ -1352,9 +1348,7 @@
 		((RangeObject *)(self))->end-((RangeObject *)(self))->start+1,
 		&start, &stop,
 		&step, &slicelen) < 0)
-	{
 	    return NULL;
-	}
 	return RangeSlice((RangeObject *)(self), start, stop);
     }
     else
@@ -1371,7 +1365,8 @@
     {
 	long n = PyLong_AsLong(idx);
 	return RangeAsItem(self, n, val);
-    } else if (PySlice_Check(idx))
+    }
+    else if (PySlice_Check(idx))
     {
 	Py_ssize_t start, stop, step, slicelen;
 
@@ -1379,9 +1374,7 @@
 		((RangeObject *)(self))->end-((RangeObject *)(self))->start+1,
 		&start, &stop,
 		&step, &slicelen) < 0)
-	{
 	    return -1;
-	}
 	return RangeAsSlice(self, start, stop, val);
     }
     else