Properly check mmap return value

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5150>

diff --git a/src/freedreno/perfcntrs/fdperf.c b/src/freedreno/perfcntrs/fdperf.c
index cc5e90c39d90b45581823dacc6d1d2a14d54452f..976f6ee77bb465aaa42c0bbb15d218a5107be712 100644 (file)
--- a/src/freedreno/perfcntrs/fdperf.c
+++ b/src/freedreno/perfcntrs/fdperf.c
@@ -332,7 +332,7 @@ find_device(void)
                err(1, "could not open /dev/mem");
 
        dev.io = mmap(0, dev.size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, dev.base);
-       if (!dev.io) {
+       if (dev.io == MAP_FAILED) {
                close(fd);
                err(1, "could not map device");
        }