linux: fix LINUX_SITE for release candidates

Signed-off-by: Jean-Baptiste Theou <jtheou@adeneo-embedded.us>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

linux/linux.mk

@@ -34,7 +34,7 @@ LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x
 endif
 # release candidates are in testing/ subdir
 ifneq ($(findstring -rc,$(LINUX_VERSION)),)
-LINUX_SITE := $(LINUX_SITE)testing/
+LINUX_SITE := $(LINUX_SITE)/testing/
 endif # -rc
 endif