Fixed bug in ZIP file signature

src/binwalk/magic/archives

@@ -38,12 +38,10 @@
 >4      byte        0x2d
 >>30    ubelong     !0x6d696d65     at least v3.0 to extract,
 >18     lelong      !0
->>18    lelong      <-1             {invalid}
->>18    lelong      x               compressed size: %d,
->>18    lelong      x               {jump:%d}
+>>18    ulelong      x              compressed size: %d,
+>>18    ulelong      x              {jump:%d}
 >22     lelong      !0
->>22    lelong      <-1             {invalid}
->>22    lelong      x               uncompressed size: %d,
+>>22    ulelong     x               uncompressed size: %d,
 >30     byte        <0x2D           {invalid}
 >30     byte        >0x7A           {invalid}
 >26     leshort     x               {strlen:%d}