remove incorrect asserts in innodb/xtradb. 0 is a valid file handle value.

storage/innobase/os/os0file.cc

@@ -1999,8 +1999,6 @@ os_file_close_func(
 #ifdef __WIN__
 	BOOL	ret;
 
-	ut_a(file);
-
 	ret = CloseHandle(file);
 
 	if (ret) {
@@ -2038,8 +2036,6 @@ os_file_close_no_error_handling(
 #ifdef __WIN__
 	BOOL	ret;
 
-	ut_a(file);
-
 	ret = CloseHandle(file);
 
 	if (ret) {
@@ -2266,8 +2262,6 @@ os_file_flush_func(
 #ifdef __WIN__
 	BOOL	ret;
 
-	ut_a(file);
-
 	os_n_fsyncs++;
 
 	ret = FlushFileBuffers(file);
@@ -2598,7 +2592,6 @@ os_file_read_func(
 	os_bytes_read_since_printout += n;
 
 try_again:
-	ut_ad(file);
 	ut_ad(buf);
 	ut_ad(n > 0);
 
@@ -2725,7 +2718,6 @@ os_file_read_no_error_handling_func(
 	os_bytes_read_since_printout += n;
 
 try_again:
-	ut_ad(file);
 	ut_ad(buf);
 	ut_ad(n > 0);
 
@@ -2861,7 +2853,6 @@ os_file_write_func(
 
 	os_n_file_writes++;
 
-	ut_ad(file);
 	ut_ad(buf);
 	ut_ad(n > 0);
 retry:
@@ -4581,7 +4572,6 @@ os_aio_func(
 #endif /* WIN_ASYNC_IO */
 	ulint		wake_later;
 
-	ut_ad(file);
 	ut_ad(buf);
 	ut_ad(n > 0);
 	ut_ad(n % OS_FILE_LOG_BLOCK_SIZE == 0);

storage/xtradb/os/os0file.cc

@@ -2163,8 +2163,6 @@ os_file_close_func(
 #ifdef __WIN__
 	BOOL	ret;
 
-	ut_a(file);
-
 	ret = CloseHandle(file);
 
 	if (ret) {
@@ -2201,8 +2199,6 @@ os_file_close_no_error_handling(
 #ifdef __WIN__
 	BOOL	ret;
 
-	ut_a(file);
-
 	ret = CloseHandle(file);
 
 	if (ret) {
@@ -2452,8 +2448,6 @@ os_file_flush_func(
 #ifdef __WIN__
 	BOOL	ret;
 
-	ut_a(file);
-
 	os_n_fsyncs++;
 
 	ret = FlushFileBuffers(file);
@@ -2856,7 +2850,6 @@ os_file_read_func(
 	os_bytes_read_since_printout += n;
 
 try_again:
-	ut_ad(file);
 	ut_ad(buf);
 	ut_ad(n > 0);
 
@@ -2956,7 +2949,6 @@ os_file_read_no_error_handling_func(
 	os_bytes_read_since_printout += n;
 
 try_again:
-	ut_ad(file);
 	ut_ad(buf);
 	ut_ad(n > 0);
 
@@ -3062,7 +3054,6 @@ os_file_write_func(
 
 	os_n_file_writes++;
 
-	ut_ad(file);
 	ut_ad(buf);
 	ut_ad(n > 0);
 retry:
@@ -4731,7 +4722,6 @@ os_aio_func(
 #endif
 	ulint		wake_later;
 
-	ut_ad(file);
 	ut_ad(buf);
 	ut_ad(n > 0);
 	ut_ad(n % OS_MIN_LOG_BLOCK_SIZE == 0);