scripts/sphinx-pre-install: fix script for RHEL/CentOS

There's a missing parenthesis at the script, with causes it to
fail to detect non-Fedora releases (e. g. RHEL/CentOS).

Tested with Centos 7.6.1810.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/scripts/sphinx-pre-install b/scripts/sphinx-pre-install
index f230e65..101ddd0 100755 (executable)
--- a/scripts/sphinx-pre-install
+++ b/scripts/sphinx-pre-install
@@ -371,7 +371,7 @@ sub give_redhat_hints()
        #
        # Checks valid for RHEL/CentOS version 7.x.
        #
-       if (! $system_release =~ /Fedora/) {
+       if (!($system_release =~ /Fedora/)) {
                $map{"virtualenv"} = "python-virtualenv";
        }