selftest: Rename internal function to make name available for API

Author: real-or-random

src/secp256k1.c

@@ -97,7 +97,7 @@ secp256k1_context* secp256k1_context_preallocated_create(void* prealloc, unsigne
     size_t prealloc_size;
     secp256k1_context* ret;
 
-    if (!secp256k1_selftest()) {
+    if (!secp256k1_selftest_passes()) {
         secp256k1_callback_call(&default_error_callback, "self test failed");
     }
 

src/selftest.h

@@ -25,7 +25,7 @@ static int secp256k1_selftest_sha256(void) {
     return secp256k1_memcmp_var(out, output32, 32) == 0;
 }
 
-static int secp256k1_selftest(void) {
+static int secp256k1_selftest_passes(void) {
     return secp256k1_selftest_sha256();
 }