Improvements to the mechanism that attempts to report SQLITE_CORRUPT if

pread() says that the underlying filesystem is corrupt.

FossilOrigin-Name: b887c7504e7edeba758f3c1203c6cc56eef499fe05e7e6c6d82939bf7d78c57f

src/malloc.c

@@ -799,9 +799,6 @@ static SQLITE_NOINLINE int apiHandleError(sqlite3 *db, int rc){
     sqlite3Error(db, SQLITE_NOMEM);
     return SQLITE_NOMEM_BKPT;
   }
-  if( rc==SQLITE_IOERR_CORRUPTFS ){
-    return SQLITE_CORRUPT_BKPT;
-  }
   return rc & db->errMask;
 }
 

src/os_unix.c

@@ -3384,7 +3384,6 @@ static int unixRead(
     */
     switch( pFile->lastErrno ){
       case ERANGE:
-      case ENOENT:
       case EIO:
 #ifdef ENXIO
       case ENXIO:

src/vdbe.c

@@ -8157,7 +8157,11 @@ default: {          /* This is really OP_Noop, OP_Explain */
   ** an error of some kind.
   */
 abort_due_to_error:
-  if( db->mallocFailed ) rc = SQLITE_NOMEM_BKPT;
+  if( db->mallocFailed ){
+    rc = SQLITE_NOMEM_BKPT;
+  }else if( rc==SQLITE_IOERR_CORRUPTFS ){
+    rc = SQLITE_CORRUPT_BKPT;
+  }
   assert( rc );
   if( p->zErrMsg==0 && rc!=SQLITE_IOERR_NOMEM ){
     sqlite3VdbeError(p, "%s", sqlite3ErrStr(rc));