fix(inf): correct deprecated CRC= separated-value lookup

The deprecated CRC form ("CRC= 1A2B" with a space after the equals)
was never matched because the code checked for the literal key "CRC="
in the extra_info dict instead of "CRC". The dict key is always the
part before the equals sign, so the condition was dead code.

Author: acscpt

src/beebtools/inf.py

@@ -491,7 +491,7 @@ def parseInf(line: str) -> InfData:
         # A single "CRC=" token is handled above; the deprecated form
         # shows up as two tokens: "CRC=" and a hex field. We only
         # honour this when the "CRC=" key has no value attached.
-        if "CRC=" in extra_info and extra_info.get("CRC") == "":
+        if "CRC" in extra_info and extra_info.get("CRC") == "":
             extra_info["CRC"] = token
             idx += 1
             continue

tests/test_inf.py

@@ -103,6 +103,13 @@ def testLockBeforeCrc(self) -> None:
         assert result.locked is True
         assert result.crc == 0xABCD
 
+    def testDeprecatedCrcSeparatedValue(self) -> None:
+        """Deprecated CRC= with a space before the value is accepted."""
+        result = parseInf("$.BOOT FF1900 FF8023 000A00 CRC= 1A2B")
+
+        assert result.crc == 0x1A2B
+        assert result.extra_info["CRC"] == "1A2B"
+
 
 # =======================================================================
 # parseInf - syntax 3 (name access) - ADFS Explorer directory form