[net] fix a small memory leak in the update check

* A 257-byte signature buffer was not being freed if check for BETAs was enabled.

src/net.c

@@ -699,6 +699,9 @@ static DWORD WINAPI CheckForUpdatesThread(LPVOID param)
 #endif
 	vuprintf("Using %s for the update check", RUFUS_URL);
 	for (k=0; (k<max_channel) && (!found_new_version); k++) {
+		// Free any previous buffers we might have used
+		safe_free(buf);
+		safe_free(sig);
 		uprintf("Checking %s channel...", channel[k]);
 		// At this stage we can query the server for various update version files.
 		// We first try to lookup for "<appname>_<os_arch>_<os_version_major>_<os_version_minor>.ver"
@@ -770,7 +773,6 @@ static DWORD WINAPI CheckForUpdatesThread(LPVOID param)
 		if (!pfHttpQueryInfoA(hRequest, HTTP_QUERY_CONTENT_LENGTH|HTTP_QUERY_FLAG_NUMBER, (LPVOID)&dwTotalSize, &dwSize, NULL))
 			goto out;
 
-		safe_free(buf);
 		// Make sure the file is NUL terminated
 		buf = (char*)calloc(dwTotalSize+1, 1);
 		if (buf == NULL)

src/rufus.rc

@@ -33,7 +33,7 @@ LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
 IDD_DIALOG DIALOGEX 12, 12, 232, 326
 STYLE DS_SETFONT | DS_MODALFRAME | DS_CENTER | WS_MINIMIZEBOX | WS_POPUP | WS_CAPTION | WS_SYSMENU
 EXSTYLE WS_EX_ACCEPTFILES
-CAPTION "Rufus 3.9.1584"
+CAPTION "Rufus 3.9.1585"
 FONT 9, "Segoe UI Symbol", 400, 0, 0x0
 BEGIN
     LTEXT           "Drive Properties",IDS_DRIVE_PROPERTIES_TXT,8,6,53,12,NOT WS_GROUP
@@ -394,8 +394,8 @@ END
 //
 
 VS_VERSION_INFO VERSIONINFO
- FILEVERSION 3,9,1584,0
- PRODUCTVERSION 3,9,1584,0
+ FILEVERSION 3,9,1585,0
+ PRODUCTVERSION 3,9,1585,0
  FILEFLAGSMASK 0x3fL
 #ifdef _DEBUG
  FILEFLAGS 0x1L
@@ -413,13 +413,13 @@ BEGIN
             VALUE "Comments", "https://rufus.ie"
             VALUE "CompanyName", "Akeo Consulting"
             VALUE "FileDescription", "Rufus"
-            VALUE "FileVersion", "3.9.1584"
+            VALUE "FileVersion", "3.9.1585"
             VALUE "InternalName", "Rufus"
             VALUE "LegalCopyright", "© 2011-2019 Pete Batard (GPL v3)"
             VALUE "LegalTrademarks", "https://www.gnu.org/licenses/gpl-3.0.html"
             VALUE "OriginalFilename", "rufus-3.9.exe"
             VALUE "ProductName", "Rufus"
-            VALUE "ProductVersion", "3.9.1584"
+            VALUE "ProductVersion", "3.9.1585"
         END
     END
     BLOCK "VarFileInfo"