Merge branch 'memory_leak' into 'master'

Free the offsets array at the end of the particle sorting routines.

See merge request swift/swiftsim!538

src/space.c

@@ -1420,7 +1420,9 @@ void space_parts_sort(struct part *parts, struct xpart *xparts, int *ind,
   for (int k = 0; k < num_bins; k++)
     if (offsets[k + 1] != offsets[k] + counts[k])
       error("Bad offsets after shuffle.");
-#endif  // SWIFT_DEBUG_CHECKS
+#endif /* SWIFT_DEBUG_CHECKS */
+
+  free(offsets);
 }
 
 /**
@@ -1475,7 +1477,9 @@ void space_sparts_sort(struct spart *sparts, int *ind, int *counts,
   for (int k = 0; k < num_bins; k++)
     if (offsets[k + 1] != offsets[k] + counts[k])
       error("Bad offsets after shuffle.");
-#endif  // SWIFT_DEBUG_CHECKS
+#endif /* SWIFT_DEBUG_CHECKS */
+
+  free(offsets);
 }
 
 /**
@@ -1537,7 +1541,9 @@ void space_gparts_sort(struct gpart *gparts, struct part *parts,
   for (int k = 0; k < num_bins; k++)
     if (offsets[k + 1] != offsets[k] + counts[k])
       error("Bad offsets after shuffle.");
-#endif  // SWIFT_DEBUG_CHECKS
+#endif /* SWIFT_DEBUG_CHECKS */
+
+  free(offsets);
 }
 
 /**