screenshooter: Add missing newline and use program_invocation_short_name

diff --git a/clients/screenshot.c b/clients/screenshot.c
index 1c0f203..2a6d9b3 100644 (file)
--- a/clients/screenshot.c
+++ b/clients/screenshot.c
@@ -268,8 +268,8 @@ int main(int argc, char *argv[])
 
        if (getenv("WAYLAND_SOCKET") == NULL) {
                fprintf(stderr, "%s must be launched by weston.\n"
-                       "Use the MOD+S shortcut to take a screenshot.",
-                       argv[0]);
+                       "Use the MOD+S shortcut to take a screenshot.\n",
+                       program_invocation_short_name);
                return -1;
        }