sbsigntool -> sbsign

Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>

Makefile

@@ -4,16 +4,16 @@ CPPFLAGS = -I. $(ccan_includes)
 CFLAGS = -Wall -Werror -Wextra -ggdb --std=c99
 LDFLAGS = -fwhole-program
 
-sbsigntool_objs = sbsigntool.o idc.o image.o
+sbsign_objs = sbsign.o idc.o image.o
 sbverify_objs = sbverify.o image.o
 libs = -lbfd -lcrypto
 
 ccan_objs = lib/ccan/libccan.a
 ccan_includes = -I./lib/ccan
 
-all: sbsigntool sbverify
+all: sbsign sbverify
 
-sbsigntool: $(sbsigntool_objs) $(ccan_objs)
+sbsign: $(sbsign_objs) $(ccan_objs)
 	$(LINK.o) -o $@ $^ $(libs)
 
 sbverify: $(sbverify_objs) $(ccan_objs)
@@ -27,5 +27,5 @@ $(ccan_objs):
 	cd $(@D) && $(MAKE)
 
 clean:
-	rm -f sbsigntool
+	rm -f sbsign
 	rm -f *.o