jool-kmod: Fix S trailing slash build warning

This fixes the following warning:

WARNING:
[...]jool-kmod_git.bb: Recipe jool-kmod sets S variable with trailing
slash '[...]/jool-kmod/git-r0/git/src/mod/', remove it

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-oniro-staging/recipes-connectivity/jool/jool-kmod_git.bb

@@ -8,7 +8,7 @@ DESCRIPTION = "Jool SIIT and NAT64 kernel modules for Linux."
 
 LIC_FILES_CHKSUM = "file://../../COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263"
 
-S = "${WORKDIR}/git/src/mod/"
+S = "${WORKDIR}/git/src/mod"
 
 DEPENDS = "virtual/kernel"