static analysis: ensure sym is set

Set sym to an invalid value so that the test fails if it is not decoded.

Change-Id: I5c953807c5a1e35aa0621cceddb16b0b7ba2567d

test/ec_test.cc

diff --git a/test/ec_test.cc b/test/ec_test.cc
index e6a5ea6..853abcb 100644
--- a/test/ec_test.cc
+++ b/test/ec_test.cc
@@ -22,7 +22,6 @@
   int sz;
   int i;
   int ret;
-  unsigned int sym;
   unsigned int seed;
   unsigned char *ptr;
   uint32_t ptr_sz;
@@ -90,6 +89,8 @@
         << " (Random seed: " << seed << ").\n";
     for (j = 0; j < sz; j++) {
       int dec_method;
+      unsigned int sym = data[j] + 1;  // Initialize sym to an invalid value.
+
       if (CDF_SHIFT == 0) {
         dec_method = 3 + (rand() & 1);
       } else {