Fix SAlloc warnings

src/salloc.c

@@ -36,18 +36,13 @@ alloc_chunk(size_t sz)
 static Chunk *
 add_chunk(SAlloc *p, Chunk *c)
 {
-    Chunk *newchunk;
-
     if (c == NULL)
-        return NULL;
+        return c;
 
-    if (p->current != NULL)
-        p->current->next = newchunk;
+    c->next = NULL;
+    c->firstfree = 0;
 
-    newchunk->next = NULL;
-    newchunk->firstfree = 0;
-
-    return newchunk;
+    return c;
 }
 
 static Chunk *
@@ -78,7 +73,7 @@ uc_new_salloc(size_t chunksz)
     if (first == NULL) {
         return NULL;
     }
-    p = &first->data.data[0];
+    p = (SAlloc *)&first->data.data[0];
     first->firstfree = sizeof *p;
     p->chunksz = chunksz;
     p->current = NULL;