assert(a && b) --> assert(a); assert(b)

Separate each statement of the form "assert(a && b);" into "assert(a);"
and "assert(b);" for more precise diagnostics, except for this clever
use in drmmode_display.c where it was used to pass a hint to developers:

	assert(num_infos <= 32 && "update return type");

test/input.c

@@ -1105,7 +1105,8 @@ cmp_attr_fields(InputAttributes * attr1, InputAttributes * attr2)
 {
     char **tags1, **tags2;
 
-    assert(attr1 && attr2);
+    assert(attr1);
+    assert(attr2);
     assert(attr1 != attr2);
     assert(attr1->flags == attr2->flags);