Fixed GeoComReturn truthiness

Author: MrClock8163

src/geocompy/protocols.py

@@ -38,6 +38,9 @@
 class GeoComReturnCode(IntEnum):
     """Base class for all GeoCom return code enums."""
 
+    def __bool__(self) -> bool:
+        return self == 0
+
 
 class GeoComResponse(Generic[_P]):
     """

src/geocompy/tps1000/__init__.py

@@ -173,8 +173,7 @@ def __init__(
         for i in range(retry):
             try:
                 self._conn.send("\n")
-                response = self.com.nullprocess()
-                if not response.error:
+                if self.com.nullprocess():
                     sleep(1)
                     break
             except Exception:

src/geocompy/tps1100/__init__.py

@@ -179,8 +179,7 @@ def __init__(
         for i in range(retry):
             try:
                 self._conn.send("\n")
-                response = self.com.nullprocess()
-                if not response.error:
+                if self.com.nullprocess():
                     sleep(1)
                     break
             except Exception:

src/geocompy/tps1200p/__init__.py

@@ -179,8 +179,7 @@ def __init__(
         for i in range(retry):
             try:
                 self._conn.send("\n")
-                response = self.com.nullprocess()
-                if not response.error:
+                if self.com.nullprocess():
                     sleep(1)
                     break
             except Exception:

src/geocompy/vivatps/__init__.py

@@ -192,8 +192,7 @@ def __init__(
         for i in range(retry):
             try:
                 self._conn.send("\n")
-                response = self.com.nullprocess()
-                if not response.error:
+                if self.com.nullprocess():
                     sleep(1)
                     break
             except Exception: