[PATCH xserver] test: Fix a thinko in simple-xinit

[Adam Jackson]

Spotted by clang courtesy of the shiny new OSX Travis target:

simple-xinit.c:90:65: warning: sizeof on pointer operation will return size of 'char *' instead of 'char [10]' [-Wsizeof-array-decay]
    ret = read(displayfd, display_string, sizeof(display_string - 1));

Signed-off-by: Adam Jackson <ajax at redhat.com>
---
 test/simple-xinit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/simple-xinit.c b/test/simple-xinit.c
index 1fc31be269..26ff12bf73 100644
--- a/test/simple-xinit.c
+++ b/test/simple-xinit.c
@@ -87,7 +87,7 @@ get_display(int displayfd)
     char display_string[10];
     ssize_t ret;
 
-    ret = read(displayfd, display_string, sizeof(display_string - 1));
+    ret = read(displayfd, display_string, sizeof(display_string) - 1);
     if (ret <= 0) {
         fprintf(stderr, "Failed reading displayfd: %s\n", strerror(errno));
         exit(1);
-- 
2.13.5