virtiofsd: Changed allocations of fuse_req to GLib functions

Replaced the allocation and deallocation of fuse_req structs
using calloc()/free() call pairs to a GLib's g_try_new0()
and g_free().

Signed-off-by: Mahmoud Mandour <ma.mandourr@gmail.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20210420154643.58439-2-ma.mandourr@gmail.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

tools/virtiofsd/fuse_lowlevel.c

@@ -106,7 +106,7 @@ static void list_add_req(struct fuse_req *req, struct fuse_req *next)
 static void destroy_req(fuse_req_t req)
 {
     pthread_mutex_destroy(&req->lock);
-    free(req);
+    g_free(req);
 }
 
 void fuse_free_req(fuse_req_t req)
@@ -130,7 +130,7 @@ static struct fuse_req *fuse_ll_alloc_req(struct fuse_session *se)
 {
     struct fuse_req *req;
 
-    req = (struct fuse_req *)calloc(1, sizeof(struct fuse_req));
+    req = g_try_new0(struct fuse_req, 1);
     if (req == NULL) {
         fuse_log(FUSE_LOG_ERR, "fuse: failed to allocate request\n");
     } else {
@@ -1684,7 +1684,7 @@ static struct fuse_req *check_interrupt(struct fuse_session *se,
         if (curr->u.i.unique == req->unique) {
             req->interrupted = 1;
             list_del_req(curr);
-            free(curr);
+            g_free(curr);
             return NULL;
         }
     }