kbuild: Fix checking of scm-identifier variable

I'm looking Makefile in the -mm branch (dated 2010-04-28-16-53) and
seeing what looks like a bug in the checking of scm-identifier. The
"ifneq ($scm-identifier)" seems to always execute "ifeq
($(LOCALVERSION,)) ...". This patch fixes the checking of
scm-identifier.

Signed-off-by: Greg Thelen <[e-mail]>
Acked-by: David Rientjes <[e-mail]>
Signed-off-by: Michal Marek <[e-mail]>

Makefile

···
 ifdef CONFIG_LOCALVERSION_AUTO
 	localver-extra = $(scm-identifier)
 else
-	ifneq ($scm-identifier,)
+	ifneq ($(scm-identifier),)
 		ifeq ($(LOCALVERSION),)
 			localver-extra = +
 		endif