Fixed 5 GCC warnings

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@6502 212acab6-be3b-0410-9dea-997c60f758d6

Source/zlib/INFBLOCK.C

@@ -169,6 +169,9 @@ uInt *hn)               /* working area: values in order of bit length */
   int y;                        /* number of dummy codes added */
   uInt z;                       /* number of entries in current table */
 
+#ifdef __GNUC__
+  r.base = 0; // Avoid GCC "may be used uninitialized in this function" warning
+#endif
 
   /* Generate counts for each bit length */
   p=c;