Remove unnecessary call to standard_testfile

This test does not build a program and does not need to call
standard_testfile.



diff --git a/gdb/testsuite/gdb.mi/mi-cmd-error.exp b/gdb/testsuite/gdb.mi/mi-cmd-error.exp
index 3f2aed2..5a3b84a 100644
--- a/gdb/testsuite/gdb.mi/mi-cmd-error.exp
+++ b/gdb/testsuite/gdb.mi/mi-cmd-error.exp
@@ -30,8 +30,6 @@
     return
 }
 
-standard_testfile
-
 # A synchronous execution execution command that errors out.
 
 proc failing_sync_execution_command {} {