target/mips: Add two missing breaks for NM_LLWPE and NM_SCWPE decoder cases

Coverity found two fallthroughs that miss break statement. Fix them.
Revieved-by: NStefan Markovic <smarkovic@wavecomp.com>
Signed-off-by: NAleksandar Markovic <amarkovic@wavecomp.com>

target/mips/translate.c

@@ -21321,6 +21321,7 @@ static int decode_nanomips_32_48_opc(CPUMIPSState *env, DisasContext *ctx)
                         check_eva(ctx);
                         check_cp0_enabled(ctx);
                         gen_llwp(ctx, rs, 0, rt, extract32(ctx->opcode, 3, 5));
+                        break;
                     default:
                         generate_exception_end(ctx, EXCP_RI);
                         break;
@@ -21339,6 +21340,7 @@ static int decode_nanomips_32_48_opc(CPUMIPSState *env, DisasContext *ctx)
                         check_eva(ctx);
                         check_cp0_enabled(ctx);
                         gen_scwp(ctx, rs, 0, rt, extract32(ctx->opcode, 3, 5));
+                        break;
                     default:
                         generate_exception_end(ctx, EXCP_RI);
                         break;