Makefile: correct path for CHECKPATCH warnings

Change-Id: I08c9789d3fd2b034b08de663d151023ca005f77f
Reported-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

Makefile

@@ -571,10 +571,10 @@ endif
 
 locate-checkpatch:
 ifndef CHECKPATCH
-	$(error "Please set CHECKPATCH to point to the Linux checkpatch.pl file, eg: CHECKPATCH=../linux/script/checkpatch.pl")
+	$(error "Please set CHECKPATCH to point to the Linux checkpatch.pl file, eg: CHECKPATCH=../linux/scripts/checkpatch.pl")
 else
 ifeq (,$(wildcard ${CHECKPATCH}))
-	$(error "The file CHECKPATCH points to cannot be found, use eg: CHECKPATCH=../linux/script/checkpatch.pl")
+	$(error "The file CHECKPATCH points to cannot be found, use eg: CHECKPATCH=../linux/scripts/checkpatch.pl")
 endif
 endif