make depend: Check that find returned a non-empty string rather than an empty

The logic to find out of there are any .d files newer than Makefile is
sound.  Checking the result was less so.

Reviewed-by: Rich Salz <rsalz@openssl.org>

diff --git a/Configurations/unix-Makefile.tmpl b/Configurations/unix-Makefile.tmpl
index e381237bb944d79cdd2e394c206267496c8ab4d1..5b9a23fd6da401ce65ed62f9c3576c4220c92615 100644 (file)
--- a/Configurations/unix-Makefile.tmpl
+++ b/Configurations/unix-Makefile.tmpl
@@ -261,7 +261,7 @@ clean: libclean
 # concatenate only if that is true.
 depend:
        @: {- output_off() if $disabled{makedepend}; "" -}
-       @if [ -z "`find $(DEPS) -newer Makefile 2>/dev/null; exit 0`" ]; then \
+       @if [ -n "`find $(DEPS) -newer Makefile 2>/dev/null; exit 0`" ]; then \
          ( sed -e '/^# DO NOT DELETE THIS LINE.*/,$$d' < Makefile; \
            echo '# DO NOT DELETE THIS LINE -- make depend depends on it.'; \
            echo; \