readlink03 test case fix

In readlink03 testcase,
When 'Symlink Pathname is empty' the return value was 'ENOENT' but with
newer kernels the return value is 'EINVAL'. The following patch will fix
this.

readlink03:
Before patch:
...
readlink03    9  TFAIL  :  readlink() failed, Symlink Pathname is empty,
errno=22, expected errno=2
...

After patch:
...
readlink03    9  TPASS  :  readlink(), Symlink Pathname is empty,
returned errno 22
readlink03   10  TPASS  :  readlink(), Symlink Pathname is empty,
returned errno 22
...

Signed-off-by: Nageswara R Sastry <rnsastry@linux.vnet.ibm.com>
Tested-by: Michal Simek <michal.simek@petalogix.com>

testcases/kernel/syscalls/readlink/readlink03.c

@@ -173,6 +173,11 @@ int main(int ac, char **av)
 				buf_size = sizeof(buffer);
 			}
 
+			if (strncmp(test_desc, "Symlink Pathname is empty", 25) == 0) {
+				if ((tst_kvercmp(2, 6, 39)) >= 0)
+					Test_cases[i].exp_errno = EINVAL;
+			}
+
 			/*
 			 * Call readlink(2) to test different test conditions.
 			 * verify that it fails with -1 return value and sets
@@ -358,4 +363,4 @@ void cleanup()
 
 	tst_rmdir();
 
-}
+}