string_test: Coverity woe

Coverity complains about dead code as shown below and it is right.
The fix is to simply remove the dead code.

503  if (v_indicator != indicator)

CID 190173 (#3 of 3): Logically dead code (DEADCODE)
dead_error_line: Execution cannot reach this statement: return -1;.
504    return -1;

Change-Id: Ibca9e10451a4459db099bef5ecc6939474bdb903
Signed-off-by: Steven Luong <[email protected]>

Author: sluong99

src/plugins/unittest/string_test.c

@@ -500,8 +500,6 @@ test_clib_strncmp (vlib_main_t * vm, unformat_input_t * input)
   v_indicator = strncmp (s1, "Every moment is a fresh beginning", s1len + 1);
   if (v_indicator != 0)
     return -1;
-  if (v_indicator != indicator)
-    return -1;
 
   /* unterminated s1 */
   s1[s1len] = 0x1;