riscv: remove unneeded semicolon

Eliminate the following coccicheck warning:
./arch/riscv/mm/kasan_init.c:219:2-3: Unneeded semicolon

Reported-by: Abaci Robot <[e-mail]>
Signed-off-by: Yang Li <[e-mail]>
Signed-off-by: Palmer Dabbelt <[e-mail]>

arch/riscv/mm/kasan_init.c

···
 			break;
 
 		kasan_populate(kasan_mem_to_shadow(start), kasan_mem_to_shadow(end));
-	};
+	}
 
 	for (i = 0; i < PTRS_PER_PTE; i++)
 		set_pte(&kasan_early_shadow_pte[i],