Add terminating `/' character missing from one of the test harness
command clauses in pr105314.c. This causes no issue with compilation
owing to another comment immediately following, but would cause a:
pr105314.c:3:1: warning: "/*" within comment [-Wcomment]
message if warnings were enabled.
gcc/testsuite/
* gcc.target/riscv/pr105314.c: Fix comment termination.
/* PR rtl-optimization/105314 */
-/* { dg-do compile } *
+/* { dg-do compile } */
/* { dg-options "-O2" } */
/* { dg-final { scan-assembler-not "\tbeq\t" } } */