soc/intel/apollolake/meminit_util_glk.c: Check for NULL

We check for NULL here for memory_info_hob and return if it's NULL
so that the future dereferencing is proper.

Change-Id: Ie34931504ad92739fdaa68ec7989e76e8eee2595
Found-by: Klockworks
Signed-off-by: Ravi Sarawadi <ravishankar.sarawadi@intel.com>
Reviewed-on: https://review.coreboot.org/23223
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/apollolake/meminit_util_glk.c

@@ -39,6 +39,10 @@ void save_lpddr4_dimm_info(const struct lpddr4_cfg *lp4cfg, size_t mem_sku)
 	}
 
 	memory_info_hob = fsp_find_smbios_memory_info(&hob_size);
+	if (memory_info_hob == NULL) {
+		printk(BIOS_ERR, "SMBIOS memory info HOB is missing\n");
+		return;
+	}
 
 	/*
 	 * Allocate CBMEM area for DIMM information used to populate SMBIOS