Review comment changes

Author: hugueskamba

tools/toolchains/mbed_toolchain.py

@@ -1410,10 +1410,11 @@ def is_library_supported(lib_type, target, toolchain):
     """
     Check if a library type is supported by a toolchain for a given target.
 
-    Return True if the library type is supported, False if not supported, and
+    Return True if the library type is supported, False if not supported or
+    the target does not have an supported_c_libs attribute.
     """
-    if (
+    return (
         hasattr(target, "supported_c_libs")
         and toolchain.lower() in target.supported_c_libs
-    ):
-        return lib_type in target.supported_c_libs[toolchain.lower()]
+        and lib_type in target.supported_c_libs[toolchain.lower()]
+    )