Merge pull request #229 from practicalswift/typos

Fix typos. Remove trailing whitespace.

uc.c

@@ -96,7 +96,7 @@ const char *uc_strerror(uc_err code)
         case UC_ERR_FETCH_UNALIGNED:
             return "Fetch from unaligned memory (UC_ERR_FETCH_UNALIGNED)";
         case UC_ERR_HOOK_EXIST:
-            return "Hook for this type event already existed (UC_ERR_HOOK_EXIST)";
+            return "Hook for this type event already exists (UC_ERR_HOOK_EXIST)";
     }
 }