Fix modules installation directory

When building zfs modules with kernel, compiled from deb.src, the
packaging process ends up installing the modules in the wrong place.

Signed-off-by: Alexander Pyhalov <apyhalov@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2822

module/Makefile.in

@@ -43,7 +43,8 @@ modules_install:
 	@# Install the kernel modules
 	$(MAKE) -C @LINUX_OBJ@ SUBDIRS=`pwd` $@ \
 		INSTALL_MOD_PATH=$(DESTDIR)$(INSTALL_MOD_PATH) \
-		INSTALL_MOD_DIR=$(INSTALL_MOD_DIR)
+		INSTALL_MOD_DIR=$(INSTALL_MOD_DIR) \
+		KERNELRELEASE=@LINUX_VERSION@
 	@# Remove extraneous build products when packaging
 	kmoddir=$(DESTDIR)$(INSTALL_MOD_PATH)/lib/modules/@LINUX_VERSION@; \
 	if [ -n $$kmoddir ]; then \