Fixed REV variable in devices Kbuild file.

devices/Kbuild

@@ -40,20 +40,23 @@ REV := $(shell if test -s $(src)/../svnrevision; then \
 	fi)
 
 ifeq ($(EC_ENABLE_8139TOO),1)
+	EC_8139TOO_OBJ := 8139too-$(EC_8139TOO_KERNEL)-ethercat.o
 	obj-m += ec_8139too.o
-	ec_8139too-objs := 8139too-$(EC_8139TOO_KERNEL)-ethercat.o
+	ec_8139too-objs := $(EC_8139TOO_OBJ)
 	CFLAGS_$(EC_8139TOO_OBJ) = -DSVNREV=$(REV)
 endif
 
 ifeq ($(EC_ENABLE_E100),1)
+	EC_E100_OBJ := e100-$(EC_E100_KERNEL)-ethercat.o
 	obj-m += ec_e100.o
-	ec_e100-objs := e100-$(EC_E100_KERNEL)-ethercat.o
+	ec_e100-objs := $(EC_E100_OBJ)
 	CFLAGS_$(EC_E100_OBJ) = -DSVNREV=$(REV)
 endif
 
 ifeq ($(EC_ENABLE_FORCEDETH),1)
+	EC_FORCEDETH_OBJ := forcedeth-$(EC_FORCEDETH_KERNEL)-ethercat.o
 	obj-m += ec_forcedeth.o
-	ec_forcedeth-objs := forcedeth-$(EC_FORCEDETH_KERNEL)-ethercat.o
+	ec_forcedeth-objs := $(EC_FORCEDETH_OBJ)-ethercat.o
 	CFLAGS_$(EC_FORCEDETH_OBJ) = -DSVNREV=$(REV)
 endif