use the correct name

Author: kazuho

include/picotls.h

@@ -1983,7 +1983,7 @@ char *ptls_jsonescape(char *buf, const char *s, size_t len);
 /**
  * builds a v4-mapped address (i.e., ::ffff:192.0.2.1)
  */
-static void ptls_build_mapped_v4_address(struct in6_addr *v6, const struct in_addr *v4);
+static void ptls_build_v4_mapped_v6_address(struct in6_addr *v6, const struct in_addr *v4);
 
 /**
  * the default get_time callback
@@ -2160,7 +2160,7 @@ inline size_t ptls_aead_decrypt(ptls_aead_context_t *ctx, void *output, const vo
     return ctx->do_decrypt(ctx, output, input, inlen, seq, aad, aadlen);
 }
 
-inline void ptls_build_mapped_v4_address(struct in6_addr *v6, const struct in_addr *v4)
+inline void ptls_build_v4_mapped_v6_address(struct in6_addr *v6, const struct in_addr *v4)
 {
     *v6 = (struct in6_addr){.s6_addr[10] = 0xff, .s6_addr[11] = 0xff};
     memcpy(&v6->s6_addr[12], &v4->s_addr, 4);

lib/picotls.c

@@ -7027,7 +7027,7 @@ int ptls_log_add_fd(int fd, float sample_ratio, const char *_points, const char
                 struct in_addr v4;
                 if (!inet_pton(AF_INET, input, &v4))
                     continue;
-                ptls_build_mapped_v4_address(&addresses[index], &v4);
+                ptls_build_v4_mapped_v6_address(&addresses[index], &v4);
             }
             if (memcmp(&addresses[index], &in6addr_any, sizeof(struct in6_addr)) == 0)
                 continue;