Correction of PSI value 'io full'

'I/O full' showed the same value as 'I/O some', which has been
corrected now.

showsys.c

@@ -1594,7 +1594,7 @@ sysprt_PSIIOF(void *p, void *q, int badness, int *color)
 {
         struct sstat *sstat=p;
         static char buf[16];
-	psiformat(&(sstat->psi.iosome), "if", buf, sizeof buf);
+	psiformat(&(sstat->psi.iofull), "if", buf, sizeof buf);
         return buf;
 }
 sys_printdef syspdef_PSIIOF = {"PSIIOF", sysprt_PSIIOF};