linuxptp: remove trailing backslashes

Thanks to Yann E. Morin for spotting these.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/linuxptp/linuxptp.mk

@@ -13,12 +13,12 @@ LINUXPTP_LICENSE_FILES = COPYING
 LINUXPTP_MAKE_ENV = \
 	$(TARGET_MAKE_ENV) \
 	CROSS_COMPILE="$(TARGET_CROSS)" \
-	KBUILD_OUTPUT=$(STAGING_DIR) \
+	KBUILD_OUTPUT=$(STAGING_DIR)
 
 LINUXPTP_MAKE_OPTS = \
 	prefix=/usr \
 	EXTRA_CFLAGS="$(TARGET_CFLAGS)" \
-	EXTRA_LDFLAGS="$(TARGET_LDFLAGS)" \
+	EXTRA_LDFLAGS="$(TARGET_LDFLAGS)"
 
 define LINUXPTP_BUILD_CMDS
 	$(LINUXPTP_MAKE_ENV) $(MAKE) $(LINUXPTP_MAKE_OPTS) -C $(@D) all