Add new error code PLATFORM_ALLOC_FAILED for mbedtls_platform_memmove()

Signed-off-by: Piotr Nowicki <piotr.nowicki@arm.com>
diff --git a/library/error.c b/library/error.c
index ecdec78..893de7f 100644
--- a/library/error.c
+++ b/library/error.c
@@ -843,6 +843,8 @@
         mbedtls_snprintf( buf, buflen, "PLATFORM - The requested feature is not supported by the platform" );
     if( use_ret == -(MBEDTLS_ERR_PLATFORM_FAULT_DETECTED) )
         mbedtls_snprintf( buf, buflen, "PLATFORM - A hardware fault was detected in a critical path. As a security precaution this should be treated as a potential physical attack" );
+    if( use_ret == -(MBEDTLS_ERR_PLATFORM_ALLOC_FAILED) )
+        mbedtls_snprintf( buf, buflen, "PLATFORM - Memory allocation failed" );
 #endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_POLY1305_C)