Fix _fallback_srcs check (#2521)

Signed-off-by: Brentley Jones <github@brentleyjones.com>

Author: brentleyjones

apple/internal/local_provisioning_profiles.bzl

@@ -141,7 +141,7 @@ def _local_provisioning_profile(ctx):
         args.add_all("--local_profiles", ctx.files._local_srcs)
     if ctx.files._fallback_srcs:
         args.add_all("--fallback_profiles", ctx.files._fallback_srcs)
-    if not ctx.files._local_srcs and not ctx.attr._fallback_srcs:
+    if not ctx.files._local_srcs and not ctx.files._fallback_srcs:
         fail("Either local or fallback provisioning profiles must exist")
 
     ctx.actions.run(