[Stability][hwui] check mmap return value

If mmap failed, it return -1 (MAP_FAILED)

Bug:110507462
Test: manual

Change-Id: I3d0bac2e7c8b0bdc9cfb4ebb7b766d858876679d
Signed-off-by: zhangkuili <zhangkuili@xiaomi.com>

libs/hwui/service/GraphicsStatsService.cpp

@@ -134,7 +134,7 @@ bool GraphicsStatsService::parseFromFile(const std::string& path, service::Graph
         return false;
     }
     void* addr = mmap(nullptr, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
-    if (!addr) {
+    if (addr == MAP_FAILED) {
         int err = errno;
         // The file not existing is normal for addToDump(), so only log if
         // we get an unexpected error