Fix typos of occurred and occurrence

llvm-svn: 323316
diff --git a/clang/tools/scan-build-py/libscanbuild/analyze.py b/clang/tools/scan-build-py/libscanbuild/analyze.py
index b5614b5..6c129bd 100644
--- a/clang/tools/scan-build-py/libscanbuild/analyze.py
+++ b/clang/tools/scan-build-py/libscanbuild/analyze.py
@@ -317,7 +317,7 @@
 
         return arch_check(opts)
     except Exception:
-        logging.error("Problem occured during analyzis.", exc_info=1)
+        logging.error("Problem occurred during analyzis.", exc_info=1)
         return None