[dvsim/lint/syn] Properly set the errors_seen value to return nonzero status

Signed-off-by: Michael Schaffner <msf@opentitan.org>
diff --git a/util/dvsim/LintCfg.py b/util/dvsim/LintCfg.py
index 00471ce..6cb895c 100644
--- a/util/dvsim/LintCfg.py
+++ b/util/dvsim/LintCfg.py
@@ -184,13 +184,16 @@
                              ("Lint Warnings", "lint_warnings"),
                              ("Lint Errors", "lint_errors")]
 
-            has_msg = False
+
+            # Lint fails if any warning or error message has occurred
+            self.errors_seen = False
             for _, key in hdr_key_pairs:
                 if key in self.result:
-                    has_msg = True
-                    break
+                    if self.result.get(key):
+                        self.errors_seen = True
+                        break
 
-            if has_msg:
+            if self.errors_seen:
                 fail_msgs += "\n### Errors and Warnings for Build Mode `'" + mode.name + "'`\n"
                 for hdr, key in hdr_key_pairs:
                     msgs = self.result.get(key)
diff --git a/util/dvsim/SynCfg.py b/util/dvsim/SynCfg.py
index 4deae7e..4a6991c 100644
--- a/util/dvsim/SynCfg.py
+++ b/util/dvsim/SynCfg.py
@@ -358,14 +358,17 @@
                              ("Elab Errors", "elab_errors"),
                              ("Compile Warnings", "compile_warnings"),
                              ("Compile Errors", "compile_errors")]
+
+            # Synthesis fails if any warning or error message has occurred
+            self.errors_seen = False
             fail_msgs = ""
-            has_msg = False
             for _, key in hdr_key_pairs:
                 if key in self.result['messages']:
-                    has_msg = True
-                    break
+                    if self.result.get(key):
+                        self.errors_seen = True
+                        break
 
-            if has_msg:
+            if self.errors_seen:
                 fail_msgs += "\n### Errors and Warnings for Build Mode `'" + mode.name + "'`\n"
                 for hdr, key in hdr_key_pairs:
                     msgs = self.result['messages'].get(key)