Convert degenerate memcmp() to strncmp() in SQLite TimeMachine patch.

third_party/sqlite/src/src/pager.c

 /*
 ** 2001 September 15
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
@@ skipping 5191 matching lines @@
         );
   #else
         rc = sqlite3OsOpen(pVfs, pPager->zJournal, pPager->jfd, flags, 0);
   #endif
 #if defined(__APPLE__)
         /* Set the TimeMachine exclusion metadata for the journal if it has
         ** been set for the database. Only do this for unix-type vfs
         ** implementations. */
         if( rc==SQLITE_OK && pPager->zFilename!=NULL
          && strlen(pPager->zFilename)>0
-         && memcmp(pVfs->zName, "unix", 4)==0
+         && strncmp(pVfs->zName, "unix", 4)==0
          && ( pVfs->zName[4]=='-' || pVfs->zName[4]=='\0' ) ){
           CFURLRef database = create_cfurl_from_cstring(pPager->zFilename);
           if( CSBackupIsItemExcluded(database, NULL) ){
             CFURLRef journal = create_cfurl_from_cstring(pPager->zJournal);
             /* Ignore errors from the following exclusion call. */
             CSBackupSetItemExcluded(journal, TRUE, FALSE);
             CFRelease(journal);
           }
           CFRelease(database);
         }
@@ skipping 1738 matching lines @@
 void *sqlite3PagerCodec(PgHdr *pPg){
   void *aData = 0;
   CODEC2(pPg->pPager, pPg->pData, pPg->pgno, 6, return 0, aData);
   return aData;
 }
 #endif /* SQLITE_HAS_CODEC */
 
 #endif /* !SQLITE_OMIT_WAL */
 
 #endif /* SQLITE_OMIT_DISKIO */