Fix clang-detected issues.

Author: michaelrsweet

cups/file.c

@@ -2215,7 +2215,9 @@ cups_open(const char *filename,		// I - Filename
   // Then verify that the file descriptor doesn't point to a directory or hard-linked file.
   if (fstat(fd, &fileinfo))
   {
+    int temp = errno;
     close(fd);
+    errno = temp;
     return (-1);
   }
 
@@ -2241,7 +2243,9 @@ cups_open(const char *filename,		// I - Filename
   // Then use lstat to determine whether the filename is a symlink...
   if (lstat(filename, &linkinfo))
   {
+    int temp = errno;
     close(fd);
+    errno = temp;
     return (-1);
   }
 

cups/ipp-file.c

@@ -33,7 +33,6 @@ struct _ipp_file_s			// IPP data file
   cups_option_t		*vars;		// Variables
   ipp_fattr_cb_t	attr_cb;	// Attribute (filter) callback
   ipp_ferror_cb_t	error_cb;	// Error reporting callback
-  ipp_ftoken_cb_t	token_cb;	// Token processing callback
   void			*cb_data;	// Callback data
   char			*buffer;	// Output buffer
   size_t		alloc_buffer;	// Size of output buffer

cups/oauth.c

@@ -1331,12 +1331,15 @@ cupsOAuthGetTokens(
 
   if (error)
   {
-    // Handle "soft" device access token errors by setting access_expires to
-    // the next call time...
-    if (!strcmp(error, "slow_down"))
-      *access_expires = time(NULL) + 10;
-    else
-      *access_expires = time(NULL) + 5;
+    if (access_expires)
+    {
+      // Handle "soft" device access token errors by setting access_expires to
+      // the next call time...
+      if (!strcmp(error, "slow_down"))
+	*access_expires = time(NULL) + 10;
+      else
+	*access_expires = time(NULL) + 5;
+    }
 
     // Free memory and return...
     cupsJSONDelete(response);