qrexec-lib: convert tabs to spaces

- Fix compile error on gcc 6 (-Werror=misleading-indentation)
- Follow coding style: https://www.qubes-os.org/doc/coding-style/

qrexec-lib/buffer.c

@@ -62,10 +62,10 @@ void buffer_free(struct buffer *b)
 }
 
 /*
-The following two functions can be made much more efficient.
-Yet the profiling output show they are not significant CPU hogs, so
-we keep them so simple to make them obviously correct.
-*/
+   The following two functions can be made much more efficient.
+   Yet the profiling output show they are not significant CPU hogs, so
+   we keep them so simple to make them obviously correct.
+   */
 
 void buffer_append(struct buffer *b, const char *data, int len)
 {

qrexec-lib/ioall.c

@@ -61,7 +61,7 @@ int write_all(int fd, const void *buf, int size)
         }
         written += ret;
     }
-//      fprintf(stderr, "sent %d bytes\n", size);
+    //      fprintf(stderr, "sent %d bytes\n", size);
     return 1;
 }
 
@@ -89,7 +89,7 @@ int read_all(int fd, void *buf, int size)
         }
         got_read += ret;
     }
-//      fprintf(stderr, "read %d bytes\n", size);
+    //      fprintf(stderr, "read %d bytes\n", size);
     return 1;
 }
 

qrexec-lib/unix-server.c

@@ -49,7 +49,7 @@ int get_server_socket(const char *socket_address)
         close(s);
         exit(1);
     }
-//      chmod(sockname.sun_path, 0666);
+    //      chmod(sockname.sun_path, 0666);
     if (listen(s, 5) == -1) {
         perror("listen() failed\n");
         close(s);

qrexec-lib/unpack.c

@@ -94,9 +94,9 @@ void fix_times_and_perms(struct file_header *untrusted_hdr,
         const char *untrusted_name)
 {
     struct timeval times[2] =
-	    { {untrusted_hdr->atime, untrusted_hdr->atime_nsec / 1000},
-	    {untrusted_hdr->mtime,
-	     untrusted_hdr->mtime_nsec / 1000}
+    { 
+        {untrusted_hdr->atime, untrusted_hdr->atime_nsec / 1000},
+        {untrusted_hdr->mtime, untrusted_hdr->mtime_nsec / 1000}
     };
     if (chmod(untrusted_name, untrusted_hdr->mode & 07777))  /* safe because of chroot */
         do_exit(errno, untrusted_name);
@@ -155,8 +155,8 @@ void process_one_file_reg(struct file_header *untrusted_hdr,
 void process_one_file_dir(struct file_header *untrusted_hdr,
         const char *untrusted_name)
 {
-// fix perms only when the directory is sent for the second time
-// it allows to transfer r.x directory contents, as we create it rwx initially
+    // fix perms only when the directory is sent for the second time
+    // it allows to transfer r.x directory contents, as we create it rwx initially
     struct stat buf;
     if (!mkdir(untrusted_name, 0700)) /* safe because of chroot */
         return;

qrexec-lib/write-stdin.c

@@ -59,9 +59,9 @@ int flush_client_data(int fd, struct buffer *buffer)
 }
 
 /*
-Write "len" bytes from "data" to "fd". If not all written, buffer the rest
-to "buffer".
-*/
+ * Write "len" bytes from "data" to "fd". If not all written, buffer the rest
+ * to "buffer".
+ */
 int write_stdin(int fd, const char *data, int len, struct buffer *buffer)
 {
     int ret;
@@ -92,10 +92,10 @@ int write_stdin(int fd, const char *data, int len, struct buffer *buffer)
 }
 
 /* 
-Data feed process has exited, so we need to clear all control structures for 
-the client. However, if we have buffered data for the client (which is rare btw),
-fire&forget a separate process to flush them.
-*/
+ * Data feed process has exited, so we need to clear all control structures for 
+ * the client. However, if we have buffered data for the client (which is rare btw),
+ * fire&forget a separate process to flush them.
+ */
 int fork_and_flush_stdin(int fd, struct buffer *buffer)
 {
     int i;