[PATCH] scripts/setlocalversion: fix a bug when LOCALVERSION is empty

[Mikulas Patocka]

The patch 042da426f8ebde012be9429ff705232af7ad7469 
("scripts/setlocalversion: simplify the short version part") reduces the 
indentation. Unfortunatelly, it also changes behavior in a subtle way - if 
the user has empty "LOCALVERSION" variable, the plus sign is appended to 
the kernel version. It wasn't appended before.

This patch reverts to the old behavior - we append the plus sign only if
the LOCALVERSION variable is not set.

Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Fixes: 042da426f8eb ("scripts/setlocalversion: simplify the short version part")

---
 scripts/setlocalversion |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/scripts/setlocalversion
===================================================================
--- linux-2.6.orig/scripts/setlocalversion	2021-07-12 15:29:07.000000000 +0200
+++ linux-2.6/scripts/setlocalversion	2021-07-12 15:50:29.000000000 +0200
@@ -131,7 +131,7 @@ res="${res}${CONFIG_LOCALVERSION}${LOCAL
 if test "$CONFIG_LOCALVERSION_AUTO" = "y"; then
 	# full scm version string
 	res="$res$(scm_version)"
-elif [ -z "${LOCALVERSION}" ]; then
+elif [ "${LOCALVERSION+set}" != "set" ]; then
 	# append a plus sign if the repository is not in a clean
 	# annotated or signed tagged state (as git describe only
 	# looks at signed or annotated tags - git tag -a/-s) and