Issue #7788: Fix a crash produced by deleting a list slice with huge
step value.  Patch by Marcin Bachry.

Modules/arraymodule.c

diff --git a/Modules/arraymodule.c b/Modules/arraymodule.c
index 018ab87..c631b61 100644
--- a/Modules/arraymodule.c
+++ b/Modules/arraymodule.c
@@ -1792,8 +1792,9 @@
 	}
 	else if (needed == 0) {
 		/* Delete slice */
-		Py_ssize_t cur, i;
-		
+		size_t cur;
+		Py_ssize_t i;
+
 		if (step < 0) {
 			stop = start + 1;
 			start = stop + step * (slicelength - 1) - 1;