m4: Don't enable bash-completion by default

Due to the way that check logic was written we basically enabled
bash completion whenever readline was enabled. This is not right
because it made bash-completion pkg-config module required.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

m4/virt-bash-completion.m4

@@ -30,14 +30,10 @@ AC_DEFUN([LIBVIRT_CHECK_BASH_COMPLETION], [
   AC_REQUIRE([LIBVIRT_CHECK_READLINE])
 
   if test "x$with_readline" != "xyes" ; then
-    if test "x$with_bash_completion" != "xyes" ; then
-      with_bash_completion=no
-    else
+    if test "x$with_bash_completion" = "xyes" ; then
       AC_MSG_ERROR([readline is required for bash completion support])
-    fi
-  else
-    if test "x$with_bash_completion" = "xcheck" ; then
-      with_bash_completion=yes
+    else
+      with_bash_completion=no
     fi
   fi