Bugzilla Bug 345941: fixed the bug that we might pass uninitialized 'req'

to fclose(). r=glen.beasley.  Thanks to Wolfgang Rosenauer
<mozilla@rosenauer.org> for the bug report.

security/nss/cmd/fipstest/fipstest.c

@@ -3088,7 +3088,7 @@ void hmac_test(char *reqfn)
     unsigned char HMAC[HASH_LENGTH_MAX];  /* computed HMAC */
     HASH_HashType hash_alg;       /* HMAC type */
 
-    FILE *req;       /* input stream from the REQUEST file */
+    FILE *req = NULL;  /* input stream from the REQUEST file */
     FILE *resp;        /* output stream to the RESPONSE file */
 
     buf = PORT_ZAlloc(bufSize);
@@ -3201,7 +3201,9 @@ void hmac_test(char *reqfn)
         }
     }
 loser:
+    if (req) {
         fclose(req);
+    }
     if (buf) {
         PORT_ZFree(buf, bufSize);
     }