reftable: change the type of array indices to 'size_t' in reftable/pq.c

The variables 'i', 'j', 'k' and 'min' are used as indices for
'pq->heap', which is an array. Additionally, 'pq->len' is of
type 'size_t' and is often used to assign values to these
variables. Hence, change the type of these variables from 'int'
to 'size_t'.

Mentored-by: Patrick Steinhardt <[email protected]>
Mentored-by: Christian Couder <[email protected]>
Signed-off-by: Chandra Pratap <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Chandra Pratap

reftable/pq.c

@@ -22,15 +22,15 @@ int pq_less(struct pq_entry *a, struct pq_entry *b)
 
 struct pq_entry merged_iter_pqueue_remove(struct merged_iter_pqueue *pq)
 {
-	int i = 0;
+	size_t i = 0;
 	struct pq_entry e = pq->heap[0];
 	pq->heap[0] = pq->heap[pq->len - 1];
 	pq->len--;
 
 	while (i < pq->len) {
-		int min = i;
-		int j = 2 * i + 1;
-		int k = 2 * i + 2;
+		size_t min = i;
+		size_t j = 2 * i + 1;
+		size_t k = 2 * i + 2;
 		if (j < pq->len && pq_less(&pq->heap[j], &pq->heap[i]))
 			min = j;
 		if (k < pq->len && pq_less(&pq->heap[k], &pq->heap[min]))
@@ -46,14 +46,14 @@ struct pq_entry merged_iter_pqueue_remove(struct merged_iter_pqueue *pq)
 
 void merged_iter_pqueue_add(struct merged_iter_pqueue *pq, const struct pq_entry *e)
 {
-	int i = 0;
+	size_t i = 0;
 
 	REFTABLE_ALLOC_GROW(pq->heap, pq->len + 1, pq->cap);
 	pq->heap[pq->len++] = *e;
 
 	i = pq->len - 1;
 	while (i > 0) {
-		int j = (i - 1) / 2;
+		size_t j = (i - 1) / 2;
 		if (pq_less(&pq->heap[j], &pq->heap[i]))
 			break;
 		SWAP(pq->heap[j], pq->heap[i]);