Renamed mpi_core_get_mont_R2_unsafe_neg -> mpi_core_get_mont_r2_unsafe_neg

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
diff --git a/library/bignum_core.h b/library/bignum_core.h
index f3d4609..503bc1d 100644
--- a/library/bignum_core.h
+++ b/library/bignum_core.h
@@ -427,7 +427,7 @@
  * \return        #MBEDTLS_ERR_MPI_DIVISION_BY_ZERO if \p N modulus is zero.
  * \return        #MBEDTLS_ERR_MPI_NEGATIVE_VALUE if \p N modulus is negative.
  */
-int mbedtls_mpi_core_get_mont_R2_unsafe( mbedtls_mpi *X,
+int mbedtls_mpi_core_get_mont_r2_unsafe( mbedtls_mpi *X,
                                          const mbedtls_mpi *N );
 
 #endif /* MBEDTLS_BIGNUM_CORE_H */