lib/tst_virt: fix is_ibmz(VIRT_IBMZ) on IBM System Z

is_ibmz(VIRT_IBMZ) always returns 0 which is incorrect on IBM System Z.
Don't check virt_type unnecessarily because it is checked later on
in the switch statement.

Fixes commit b2cc450 ("lib/tst_virt: support IBM/Z LPAR and z/VM virtualization environments").

Signed-off-by: Alexander Egorenkov <[email protected]>
Reviewed-by: Cyril Hrubis <[email protected]>

Author: eaibmz

lib/tst_virt.c

@@ -70,9 +70,6 @@ static int is_ibmz(int virt_type)
 	char line[64];
 	int found_lpar, found_zvm;
 
-	if (virt_type != VIRT_IBMZ_LPAR && virt_type != VIRT_IBMZ_ZVM)
-		return 0;
-
 	if (access("/proc/sysinfo", F_OK) != 0)
 		return 0;