initscripts: Check for logrotate in dmesg.sh

Autodetect previously hardcoded logrotate location because it can be
installed in multiple places like /usr/bin/logrotate which is very
common besides /usr/sbin

(From OE-Core rev: 277a5975d43125623b5a51ddcb48f9ee2474d0fc)

Signed-off-by: Ovidiu Vancea <ovidiu.vancea@ni.com>
Signed-off-by: Ioan-Adrian Ratiu <adrian.ratiu@ni.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/initscripts/initscripts-1.0/dmesg.sh

@@ -8,8 +8,8 @@
 ### END INIT INFO
 
 if [ -f /var/log/dmesg ]; then
-	if [ -f /usr/sbin/logrotate ]; then
-		logrotate -f /etc/logrotate-dmesg.conf
+	if LOGPATH=$(which logrotate); then
+		$LOGPATH -f /etc/logrotate-dmesg.conf
 	else
 		mv -f /var/log/dmesg /var/log/dmesg.old
 	fi