kbuild: Fix the breakage caused by "improve version string logic"

[Boaz Harrosh]

The patch: 85a256d8e0116c8f5ad276730830f5d4d473344d
	Author: David Rientjes <rientjes@xxxxxxxxxx>
	Title: kbuild: improve version string logic

Broke none Linus trees that supply their own version string and
tag system via a presence of a localversion* file at the Kernel's
root subdirectory.

After This patch. The "+" (plus) is not added if a localversion*
file is present or a CONFIG_LOCALVERSION is configured.

Signed-off-by: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
---
 Makefile |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/Makefile b/Makefile
index 654c31a..324a413 100644
--- a/Makefile
+++ b/Makefile
@@ -945,7 +945,9 @@ ifdef CONFIG_LOCALVERSION_AUTO
 else
 	ifneq ($(scm-identifier),)
 		ifeq ($(LOCALVERSION),)
-			localver-extra = +
+			ifeq ($(localver),)
+				localver-extra = +
+			endif
 		endif
 	endif
 endif
-- 
1.6.6.1

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