kbuild: Fix modules_install

modules_install failed for modules with 'ko' in their name.
Fixes this.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

scripts/Makefile.modinst

@@ -9,7 +9,7 @@ include scripts/Makefile.lib
 
 #
 
-__modules := $(sort $(shell grep -h .ko /dev/null $(wildcard $(MODVERDIR)/*.mod)))
+__modules := $(sort $(shell grep -h '\.ko' /dev/null $(wildcard $(MODVERDIR)/*.mod)))
 modules := $(patsubst %.o,%.ko,$(wildcard $(__modules:.ko=.o)))
 
 .PHONY: $(modules)