use do while instead of for loop

ldpc_decoder.hh

@@ -161,13 +161,13 @@ class LDPCDecoder
 					shift[c] = (shift[c] + 1) % M;
 				}
 				std::sort(lo, lo + cnt, [](const Loc &a, const Loc &b){ return a.off < b.off; });
-				bool wd[deg];
+				bool wd[deg], repeat;
 				for (int d = 0; d < deg; ++d)
 					wd[d] = false;
 				for (int c = 1; c < cnt; ++c)
 					if (lo[c].off == lo[c-1].off)
 						wd[c] = true;
-				for (bool repeat = true; repeat;) {
+				do {
 					TYPE par[2];
 					if (i) {
 						par[0] = pty[W*(i-1)+j];
@@ -217,7 +217,7 @@ class LDPCDecoder
 							repeat = true;
 							++c;
 						}
-				}
+				} while (repeat);
 				bl += deg;
 			}
 		}