Ensure return status is handled correctly (pandas-dev#30457)

Author: alimcmaster1

ci/code_checks.sh

@@ -122,13 +122,18 @@ if [[ -z "$CHECK" || "$CHECK" == "patterns" ]]; then
     # Check for imports from collections.abc instead of `from collections import abc`
     MSG='Check for non-standard imports' ; echo $MSG
     invgrep -R --include="*.py*" -E "from pandas.core.common import" pandas
+    RET=$(($RET + $?)) ; echo $MSG "DONE"
     invgrep -R --include="*.py*" -E "from pandas.core import common" pandas
+    RET=$(($RET + $?)) ; echo $MSG "DONE"
     invgrep -R --include="*.py*" -E "from collections.abc import" pandas
+    RET=$(($RET + $?)) ; echo $MSG "DONE"
     invgrep -R --include="*.py*" -E "from numpy import nan" pandas
+    RET=$(($RET + $?)) ; echo $MSG "DONE"
 
     # Checks for test suite
     # Check for imports from pandas.util.testing instead of `import pandas.util.testing as tm`
     invgrep -R --include="*.py*" -E "from pandas.util.testing import" pandas/tests
+    RET=$(($RET + $?)) ; echo $MSG "DONE"
     invgrep -R --include="*.py*" -E "from pandas.util import testing as tm" pandas/tests
     RET=$(($RET + $?)) ; echo $MSG "DONE"