Fix signage

libclamav/upx.c

@@ -243,15 +243,15 @@ static int pefromupx (const char *src, uint32_t ssize, char *dst, uint32_t *dsiz
   memcpy(newbuf+0xd0, pehdr,0xf8+0x28*sectcnt);
   sections = pehdr+0xf8;
   for (upd = 0; upd <sectcnt ; upd++) {
-      int32_t offset1, offset2, offset3;
-      offset1 = cli_readint32(sections+20);
-      offset2 = cli_readint32(sections+16);
+      uint32_t offset1, offset2, offset3;
+      offset1 = (uint32_t)cli_readint32(sections+20);
+      offset2 = (uint32_t)cli_readint32(sections+16);
       if (offset1 > foffset || offset2 > foffset || offset1 + offset2 > foffset) {
           free(newbuf);
           return 1;
       }
 
-      offset3 = cli_readint32(sections+12);
+      offset3 = (uint32_t)cli_readint32(sections+12);
       if (offset3-upx0 > *dsize) {
           free(newbuf);
           return 1;