Correctly check return value of getline

In case of an error (e.g. file not found or readable) getline returns -1 which
causes an endless loop. Leave the loop in such cases.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1926110 13f79535-47bb-0310-9956-ffa450edef68

Author: rpluem

Makefile.in

@@ -171,7 +171,7 @@ update-changes:
 	    cp CHANGES CHANGES.tmp ; \
 	    awk -v fname=$$i 'BEGIN{done = 0; active = 0} \
 	                    done == 0 && active == 0 && /^Changes with Apache /{ active = 1; print; next}; \
-	                    /^( *\*|Changes with Apache )/ && active == 1 && done == 0{rec=$$0; while(getline<fname){if (! ($$0 ~ /^ *$$/)){print}}printf "\n";print rec; active = 0; done = 1; next} //;' \
+	                    /^( *\*|Changes with Apache )/ && active == 1 && done == 0{rec=$$0; while((getline<fname) > 0){if (! ($$0 ~ /^ *$$/)){print}}printf "\n";print rec; active = 0; done = 1; next} //;' \
 	    CHANGES.tmp > CHANGES ; \
 	    rm CHANGES.tmp ; \
 	    if [ -n "$(SVN)" ] ; then \