fix nonsense condition

checking the stdout of a grep redirected to /dev/null is rather
pointless. also, this code had a syntax error ...

1 files changed, 2 insertions, 1 deletions

diff --git a/configure b/configure
index 86c14dd..99d460b 100755
--- a/configure
+++ b/configure
@@ -8597,7 +8597,8 @@ for file in .projects .projects.3; do
         *winmain/winmain.pro)
             [ "$XPLATFORM_MINGW" = "yes" ] || continue
             SPEC=$XQMAKESPEC ;;
-        *s60main/s60main.pro) if [ "$CFG_NOPROCESS" = "yes" ] || [ -z "`echo "$XPLATFORM" | grep "symbian" >/dev/null`"]; then
+        *s60main/s60main.pro)
+            if [ "$CFG_NOPROCESS" = "yes" ] || ! echo "$XPLATFORM" | grep "symbian" >/dev/null; then
                 continue
             fi;;
         *examples/activeqt/*) continue ;;