Add missing local variable initialization

These issues were flagged by Coverity as instances where a local
variable may be used prior to being initialized. Please note that
none of these changes fixes any particular bug, this is just an attempt
to add more robustness.

Signed-off-by: Leonid Rozenboim <leonid.rozenboim@oracle.com>
diff --git a/library/ecp.c b/library/ecp.c
index f39cb02..35265f5 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -1817,7 +1817,7 @@
     unsigned char i;
     size_t j = 0;
     const unsigned char T_size = 1U << ( w - 1 );
-    mbedtls_ecp_point *cur, *TT[COMB_MAX_PRE - 1];
+    mbedtls_ecp_point *cur, *TT[COMB_MAX_PRE - 1] = {NULL};
 
     mbedtls_mpi tmp[4];