Index: uspace/app/viewer/viewer.c
===================================================================
--- uspace/app/viewer/viewer.c	(revision 38d150e6238ab44c861f6486e46454e07caeb0f0)
+++ uspace/app/viewer/viewer.c	(revision 82d515e917f3eeeff253e4aa30e493f5f632c950)
@@ -126,6 +126,7 @@
 	}
 
-	ssize_t rd = vfs_read(fd, (aoff64_t []) {0}, tga, stat.size);
-	if ((rd < 0) || (rd != (ssize_t) stat.size)) {
+	size_t nread;
+	rc = vfs_read(fd, (aoff64_t []) {0}, tga, stat.size, &nread);
+	if (rc != EOK || nread != stat.size) {
 		free(tga);
 		vfs_put(fd);