tools: PCI: Exit with error code when test fails

This makes it easier to use pcitest in automated setups.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>

tools/pci/pcitest.c

@@ -140,6 +140,7 @@ static void run_test(struct pci_test *test)
 	}
 
 	fflush(stdout);
+	return (ret < 0) ? ret : 1 - ret; /* return 0 if test succeeded */
 }
 
 int main(int argc, char **argv)
@@ -228,6 +229,5 @@ usage:
 		return -EINVAL;
 	}
 
-	run_test(test);
-	return 0;
+	return run_test(test);
 }