Add missing `-> str` return type annotations to code generation
methods in RVGenerator. These methods return strings, and the missing
hints caused errors with static analysis tools.

Signed-off-by: Wander Lairson Costa <[email protected]>
---
 tools/verification/rvgen/rvgen/generator.py | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/tools/verification/rvgen/rvgen/generator.py 
b/tools/verification/rvgen/rvgen/generator.py
index ef6c9150f50c6..4b984869a7b3d 100644
--- a/tools/verification/rvgen/rvgen/generator.py
+++ b/tools/verification/rvgen/rvgen/generator.py
@@ -73,13 +73,13 @@ class RVGenerator:
             return f"#include <monitors/{self.parent}/{self.parent}.h>\n"
         return ""
 
-    def fill_tracepoint_handlers_skel(self):
+    def fill_tracepoint_handlers_skel(self) -> str:
         return "NotImplemented"
 
-    def fill_tracepoint_attach_probe(self):
+    def fill_tracepoint_attach_probe(self) -> str:
         return "NotImplemented"
 
-    def fill_tracepoint_detach_helper(self):
+    def fill_tracepoint_detach_helper(self) -> str:
         return "NotImplemented"
 
     def fill_main_c(self):
@@ -100,19 +100,19 @@ class RVGenerator:
 
         return main_c
 
-    def fill_model_h(self):
+    def fill_model_h(self) -> str:
         return "NotImplemented"
 
-    def fill_monitor_class_type(self):
+    def fill_monitor_class_type(self) -> str:
         return "NotImplemented"
 
-    def fill_monitor_class(self):
+    def fill_monitor_class(self) -> str:
         return "NotImplemented"
 
-    def fill_tracepoint_args_skel(self, tp_type):
+    def fill_tracepoint_args_skel(self, tp_type) -> str:
         return "NotImplemented"
 
-    def fill_monitor_deps(self):
+    def fill_monitor_deps(self) -> str:
         buff = []
         buff.append("  # XXX: add dependencies if there")
         if self.parent:
-- 
2.52.0


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