Rename variable for clarity

while working on #60

src/fellow_cache.c

@@ -5042,7 +5042,7 @@ struct fellow_cache_res
 fellow_busy_obj_getspace(struct fellow_busy *fbo, size_t *sz, uint8_t **ptr)
 {
 	struct fellow_cache_seg *fcs, *unbusy = NULL;
-	size_t max, spc, delta;
+	size_t chunksize, spc, delta;
 	struct fellow_cache_res fcr;
 
 	CHECK_OBJ_NOTNULL(fbo, FELLOW_BUSY_MAGIC);
@@ -5056,8 +5056,8 @@ fellow_busy_obj_getspace(struct fellow_busy *fbo, size_t *sz, uint8_t **ptr)
 
 	CHECK_OBJ_NOTNULL(fbo->fc, FELLOW_CACHE_MAGIC);
 	CHECK_OBJ_NOTNULL(fbo->fc->tune, STVFE_TUNE_MAGIC);
-	max = (size_t)1 << fbo->fc->tune->chunk_exponent;
-	assert(max <= FIO_MAX);
+	chunksize = (size_t)1 << fbo->fc->tune->chunk_exponent;
+	assert(chunksize <= FIO_MAX);
 
 	if (fbo->sz_returned >= fbo->fc->tune->objsize_max)
 		return (FCR_ALLOCFAIL("objsize_max reached"));
@@ -5118,8 +5118,8 @@ fellow_busy_obj_getspace(struct fellow_busy *fbo, size_t *sz, uint8_t **ptr)
 	assert_cache_seg_consistency(fcs);
 
 	spc = *sz;
-	if (spc > max)
-		spc = max;
+	if (spc > chunksize)
+		spc = chunksize;
 
 	/* we set the state of the next segment to BUSY
 	 * before we unbusy the previous to signal to