Security and warning fixes for minizip. [gvollant]

Remove unused code and unnecessary test for free().

contrib/minizip/unzip.c

@@ -112,7 +112,7 @@
 # define ALLOC(size) (malloc(size))
 #endif
 #ifndef TRYFREE
-# define TRYFREE(p) {if (p) free(p);}
+# define TRYFREE(p) { free(p);}
 #endif
 
 #define SIZECENTRALDIRITEM (0x2e)
@@ -1566,6 +1566,7 @@ extern int ZEXPORT unzOpenCurrentFile3 (unzFile file, int* method,
         pfile_in_zip_read_info->stream_initialised=Z_BZIP2ED;
       else
       {
+        TRYFREE(pfile_in_zip_read_info->read_buffer);
         TRYFREE(pfile_in_zip_read_info);
         return err;
       }
@@ -1586,6 +1587,7 @@ extern int ZEXPORT unzOpenCurrentFile3 (unzFile file, int* method,
         pfile_in_zip_read_info->stream_initialised=Z_DEFLATED;
       else
       {
+        TRYFREE(pfile_in_zip_read_info->read_buffer);
         TRYFREE(pfile_in_zip_read_info);
         return err;
       }

contrib/minizip/zip.c

@@ -1471,11 +1471,6 @@ extern int ZEXPORT zipWriteInFileInZip (zipFile file,const void* buf,unsigned in
           {
               uLong uTotalOutBefore = zi->ci.stream.total_out;
               err=deflate(&zi->ci.stream,  Z_NO_FLUSH);
-              if(uTotalOutBefore > zi->ci.stream.total_out)
-              {
-                int bBreak = 0;
-                bBreak++;
-              }
 
               zi->ci.pos_in_buffered_data += (uInt)(zi->ci.stream.total_out - uTotalOutBefore) ;
           }
@@ -1959,7 +1954,7 @@ extern int ZEXPORT zipRemoveExtraInfoBlock (char* pData, int* dataLen, short sHe
 
   int retVal = ZIP_OK;
 
-  if(pData == NULL || *dataLen < 4)
+  if(pData == NULL || dataLen == NULL || *dataLen < 4)
     return ZIP_PARAMERROR;
 
   pNewHeader = (char*)ALLOC((unsigned)*dataLen);