fix(semihosting): fix seek call failure check

The code checks that the semihosting seek call return value is not
zero instead of a negative value when there is an error condition.
This defect has been fixed.

In [1], possible return values for semihosting seek calls are
mentioned.

[1]: https://github.com/ARM-software/abi-aa/blob/main/semihosting/
semihosting.rst#sys-seek-0x0a

Change-Id: I70f09e98323e9c5bf4eeda322ac065e855e256fc
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/changelog.yaml b/changelog.yaml
index d3e235d..dd1f804 100644
--- a/changelog.yaml
+++ b/changelog.yaml
@@ -649,6 +649,9 @@
       - title: Context Management
         scope: context mgmt
 
+      - title: Semihosting
+        scope: semihosting
+
   - title: Drivers
 
     subsections: