ubsan overflow fix for multiply by 0x01010101

source/row_gcc.cc

Index: source/row_gcc.cc
diff --git a/source/row_gcc.cc b/source/row_gcc.cc
index 61fbbbd3a1deb29b1bd03a078001c989a6caa471..1ff1dc2f6e6fac8a4b1a78a508b7d48f4b1a4115 100644
--- a/source/row_gcc.cc
+++ b/source/row_gcc.cc
@@ -2900,7 +2900,7 @@ void ARGBCopyYToAlphaRow_AVX2(const uint8* src, uint8* dst, int width) {
 #ifdef HAS_SETROW_X86
 void SetRow_X86(uint8* dst, uint8 v8, int width) {
   size_t width_tmp = (size_t)(width >> 2);
-  const uint32 v32 = v8 * 0x01010101;  // Duplicate byte to all bytes.
+  const uint32 v32 = v8 * 0x01010101u;  // Duplicate byte to all bytes.
   asm volatile (
     "rep stosl " MEMSTORESTRING(eax,0) "       \n"
     : "+D"(dst),       // %0