net: use kasprintf() for socket cache names

kasprintf() makes code smaller.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/sock.c

@@ -2228,13 +2228,10 @@ int proto_register(struct proto *prot, int alloc_slab)
 		}
 
 		if (prot->rsk_prot != NULL) {
-			static const char mask[] = "request_sock_%s";
-
-			prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
+			prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
 			if (prot->rsk_prot->slab_name == NULL)
 				goto out_free_sock_slab;
 
-			sprintf(prot->rsk_prot->slab_name, mask, prot->name);
 			prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
 								 prot->rsk_prot->obj_size, 0,
 								 SLAB_HWCACHE_ALIGN, NULL);
@@ -2247,14 +2244,11 @@ int proto_register(struct proto *prot, int alloc_slab)
 		}
 
 		if (prot->twsk_prot != NULL) {
-			static const char mask[] = "tw_sock_%s";
-
-			prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
+			prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
 
 			if (prot->twsk_prot->twsk_slab_name == NULL)
 				goto out_free_request_sock_slab;
 
-			sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name);
 			prot->twsk_prot->twsk_slab =
 				kmem_cache_create(prot->twsk_prot->twsk_slab_name,
 						  prot->twsk_prot->twsk_obj_size,