freedreno: Fix file descriptor leak.

Fix defect reported by Coverity Scan.

Resource leak (RESOURCE_LEAK)
leaked_handle: Handle variable fd going out of scope leaks the handle.

Fixes: 5a13507164 ("freedreno/perfcntrs: add fdperf")
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9889>

src/freedreno/perfcntrs/freedreno_dt.c

@@ -246,10 +246,9 @@ fd_dt_find_io(void)
 		return NULL;
 
 	void *io = mmap(0, dev.size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, dev.base);
-	if (io == MAP_FAILED) {
-		close(fd);
+	close(fd);
+	if (io == MAP_FAILED)
 		return NULL;
-	}
 
 	return io;
 }