Fix some code maintenance issues

Various instances of variables being written to, but then never read.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

apps/enc.c

@@ -292,7 +292,6 @@ int enc_main(int argc, char **argv)
         }
     }
     argc = opt_num_rest();
-    argv = opt_rest();
 
     if (cipher && EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) {
         BIO_printf(bio_err, "%s: AEAD ciphers not supported\n", prog);

apps/errstr.c

@@ -107,7 +107,6 @@ int errstr_main(int argc, char **argv)
         }
     }
     argc = opt_num_rest();
-    argv = opt_rest();
 
     ret = 0;
     for (argv = opt_rest(); *argv; argv++) {

apps/openssl.c

@@ -492,7 +492,6 @@ int help_main(int argc, char **argv)
         }
     }
     argc = opt_num_rest();
-    argv = opt_rest();
 
     if (argc != 0) {
         BIO_printf(bio_err, "Usage: %s\n", prog);

apps/ts.c

@@ -320,7 +320,6 @@ int ts_main(int argc, char **argv)
         }
     }
     argc = opt_num_rest();
-    argv = opt_rest();
     if (mode == OPT_ERR || argc != 0)
         goto opthelp;
 

apps/x509.c

@@ -763,7 +763,7 @@ int x509_main(int argc, char **argv)
                 BIO_printf(out, "/*\n"
                                 " * Subject: %s\n", buf);
 
-                m = X509_NAME_oneline(X509_get_issuer_name(x), buf, sizeof buf);
+                X509_NAME_oneline(X509_get_issuer_name(x), buf, sizeof buf);
                 BIO_printf(out, " * Issuer:  %s\n"
                                 " */\n", buf);
 

crypto/asn1/asn_mime.c

@@ -187,7 +187,7 @@ static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
     if (!val)
         ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR);
     (void)BIO_flush(bio);
-    bio = BIO_pop(bio);
+    BIO_pop(bio);
     BIO_free(b64);
     return val;
 }