lib: fix sparse shadowed variable warning

pos is always set before being used, no need to declare a
second one inside the if() block.

lib/prio_heap.c:34:7: warning: symbol 'pos' shadows an earlier one
lib/prio_heap.c:30:6: originally declared here

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/prio_heap.c

@@ -31,7 +31,7 @@ void *heap_insert(struct ptr_heap *heap, void *p)
 
 	if (heap->size < heap->max) {
 		/* Heap insertion */
-		int pos = heap->size++;
+		pos = heap->size++;
 		while (pos > 0 && heap->gt(p, ptrs[(pos-1)/2])) {
 			ptrs[pos] = ptrs[(pos-1)/2];
 			pos = (pos-1)/2;