Normalize ge produced from secp256k1_pubkey_load

The output ge is normalized when sizeof(secp256k1_ge_storage) = 64
but not when it's not 64. ARG_CHECK at the end of the function
assumes normalization. So normalize ge in the other code path too.

Author: stratospher

src/secp256k1.c

@@ -249,6 +249,8 @@ static int secp256k1_pubkey_load(const secp256k1_context* ctx, secp256k1_ge* ge,
         secp256k1_fe x, y;
         secp256k1_fe_set_b32_mod(&x, pubkey->data);
         secp256k1_fe_set_b32_mod(&y, pubkey->data + 32);
+        secp256k1_fe_normalize_var(&x);
+        secp256k1_fe_normalize_var(&y);
         secp256k1_ge_set_xy(ge, &x, &y);
     }
     ARG_CHECK(!secp256k1_fe_is_zero(&ge->x));