Check for errors allocating the error strings.

Reviewed-by: Richard Levitte <levitte@openssl.org>
GH: #1330

ssl/ssl_err.c

diff --git a/ssl/ssl_err.c b/ssl/ssl_err.c
index aed91e3..f573633 100644
--- a/ssl/ssl_err.c
+++ b/ssl/ssl_err.c
@@ -661,7 +661,7 @@
 
 #endif
 
-void ERR_load_SSL_strings(void)
+int ERR_load_SSL_strings(void)
 {
 #ifndef OPENSSL_NO_ERR
 
@@ -670,4 +670,5 @@
         ERR_load_strings(0, SSL_str_reasons);
     }
 #endif
+    return 1;
 }