legal-info: fix bug leading to one package not being considered

Due to excessive parenthesis, the TARGETS_LEGAL_INFO expression was
evaluated to something like this:

  toolchain-legal-info toolchain-external-legal-info busybox-legal-info zlib-legal-info))

Yes, with the last two parenthesis. This had the effect that the
zlib-legal-info rule was never called: the last package of $(TARGETS)
$(TARGET_HOST_DEPS) $(HOST_DEPS) was never added in the legal-info
information.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Luca Ceresoli <luca@lucaceresoli.net>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

Makefile

@@ -414,7 +414,7 @@ HOST_DEPS = $(sort $(foreach dep,\
 HOST_SOURCE += $(addsuffix -source,$(sort $(TARGETS_HOST_DEPS) $(HOST_DEPS)))
 
 TARGETS_LEGAL_INFO := $(patsubst %,%-legal-info,\
-		$(TARGETS) $(TARGETS_HOST_DEPS) $(HOST_DEPS))))
+		$(TARGETS) $(TARGETS_HOST_DEPS) $(HOST_DEPS))
 
 dirs: $(BUILD_DIR) $(STAGING_DIR) $(TARGET_DIR) \
 	$(HOST_DIR) $(BINARIES_DIR)