Fix a possible null pointer dereference

- This commit would fix a potential null pointer dereference.

Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
Change-Id: Ic323bde2c4bd35c35132e4310466cd6ae7ec7aeb
Signed-off-by: George Liu <liuxiwei@inspur.com>
diff --git a/libpldm/fru.c b/libpldm/fru.c
index 207d4de..3e0887d 100644
--- a/libpldm/fru.c
+++ b/libpldm/fru.c
@@ -177,13 +177,12 @@
 	size_t record_hdr_size = sizeof(struct pldm_fru_record_data_format) -
 				 sizeof(struct pldm_fru_record_tlv);
 
-	if ((*curr_size + record_hdr_size + tlvs_size) != total_size) {
-		return PLDM_ERROR_INVALID_LENGTH;
-	}
-
 	if (fru_table == NULL || curr_size == NULL || !tlvs_size) {
 		return PLDM_ERROR_INVALID_DATA;
 	}
+	if ((*curr_size + record_hdr_size + tlvs_size) != total_size) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
 
 	struct pldm_fru_record_data_format *record =
 	    (struct pldm_fru_record_data_format *)(fru_table + *curr_size);