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/gcm.c b/library/gcm.c
index 8505cf4..6d07f87 100644
--- a/library/gcm.c
+++ b/library/gcm.c
@@ -430,7 +430,7 @@
     const unsigned char *p = input;
     unsigned char *out_p = output;
     size_t offset;
-    unsigned char ectr[16];
+    unsigned char ectr[16] = {0};
 
     if( output_size < input_length )
         return( MBEDTLS_ERR_GCM_BUFFER_TOO_SMALL );