FIx syntax error

package/Makefile.in

@@ -75,7 +75,7 @@ ROOTFS_SUFFIX:=-$(BR2_ROOTFS_SUFFIX)
 endif
 
 ifeq ($(strip $(subst ",, $(BR2_FPU_SUFFIX))),y)
-COND_ARCH_FPU_SUFFIX:=(ARCH_FPU_SUFFIX)
+COND_ARCH_FPU_SUFFIX:=$(ARCH_FPU_SUFFIX)
 else
 COND_ARCH_FPU_SUFFIX:=
 endif