bpf: crypto: fix build when CONFIG_CRYPTO=m

Crypto subsytem can be build as a module. In this case we still have to
build BPF crypto framework otherwise the build will fail.

Fixes: 3e1c6f35 ("bpf: make common crypto API for TC/XDP programs")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202405011634.4JK40epY-lkp@intel.com/Signed-off-by: Vadim Fedorenko <vadfed@meta.com>
Link: https://lore.kernel.org/r/20240501170130.1682309-1-vadfed@meta.comSigned-off-by: Martin KaFai Lau <martin.lau@kernel.org>

kernel/bpf/Makefile

@@ -44,7 +44,7 @@ obj-$(CONFIG_BPF_SYSCALL) += bpf_struct_ops.o
 obj-$(CONFIG_BPF_SYSCALL) += cpumask.o
 obj-${CONFIG_BPF_LSM} += bpf_lsm.o
 endif
-ifeq ($(CONFIG_CRYPTO),y)
+ifneq ($(CONFIG_CRYPTO),)
 obj-$(CONFIG_BPF_SYSCALL) += crypto.o
 endif
 obj-$(CONFIG_BPF_PRELOAD) += preload/