tests: qemumonitorjson: Fix schema testing of monitor commands

The 'simpleFunc' data structure is overwritten by the code generated
from the macros which initiate the tests. This means that most of the
tests would get NULL 'schema' member which means that the schema
validation would not take place.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>

tests/qemumonitorjsontest.c

@@ -2879,7 +2879,6 @@ mymain(void)
         ret = -1;
         goto cleanup;
     }
-    simpleFunc.schema = qapiData.schema;
 
 #define DO_TEST(name) \
     if (virTestRun(# name, testQemuMonitorJSON ## name, driver.xmlopt) < 0) \
@@ -2887,7 +2886,9 @@ mymain(void)
 
 #define DO_TEST_SIMPLE(CMD, FNC, ...) \
     simpleFunc = (testQemuMonitorJSONSimpleFuncData) {.cmd = CMD, .func = FNC, \
-                                       .xmlopt = driver.xmlopt, __VA_ARGS__ }; \
+                                       .xmlopt = driver.xmlopt, \
+                                       .schema = qapiData.schema, \
+                                       __VA_ARGS__ }; \
     if (virTestRun(# FNC, testQemuMonitorJSONSimpleFunc, &simpleFunc) < 0) \
         ret = -1