FS-11979 [test] Fix error message log in fst_xcheck()

src/include/test/switch_test.h

@@ -196,13 +196,13 @@ static switch_status_t fst_init_core_and_modload(const char *confdir, const char
  * Check a test /w error message
  */
 #define fst_xcheck(expr, error_msg) \
-	fct_xchk(expr, error_msg);
+	fct_xchk(expr, "%s", error_msg);
 
 /**
  * Fail a test
  */
 #define fst_fail(error_msg) \
-	fct_xchk(0, error_msg);
+	fct_xchk(0, "%s", error_msg);
 
 /**
  * Check duration relative to test start, last marked time, or last check.