replace tabs with spaces in various files

The affected files in this patch had inconsistent use of tabs vs. spaces
for indentation, and this patch eliminates the stray tabs.

Also, the opening brace of sigchld_hdl() in activate.c was moved so the
opening braces are consistent throughout the file.

src/activate/activate.c

@@ -290,16 +290,15 @@ static int do_accept(const char* name, char **argv, char **envp, int fd) {
 }
 
 /* SIGCHLD handler. */
-static void sigchld_hdl(int sig, siginfo_t *t, void *data)
-{
+static void sigchld_hdl(int sig, siginfo_t *t, void *data) {
         log_info("Child %d died with code %d", t->si_pid, t->si_status);
-	/* Wait for a dead child. */
-	waitpid(t->si_pid, NULL, 0);
+        /* Wait for a dead child. */
+        waitpid(t->si_pid, NULL, 0);
 }
 
 static int install_chld_handler(void) {
         int r;
-	struct sigaction act;
+        struct sigaction act;
         zero(act);
         act.sa_flags = SA_SIGINFO;
         act.sa_sigaction = sigchld_hdl;

src/core/execute.c

@@ -1727,10 +1727,10 @@ int exec_context_load_environment(const ExecContext *c, char ***l) {
 
                                 strv_free(r);
                                 return k;
-                         }
+                        }
                         /* Log invalid environment variables with filename */
-			if (p)
-	                        p = strv_env_clean_log(p, pglob.gl_pathv[n]);
+                        if (p)
+                                p = strv_env_clean_log(p, pglob.gl_pathv[n]);
 
                         if (r == NULL)
                                 r = p;

src/shared/missing.h

@@ -139,7 +139,7 @@ static inline int fanotify_init(unsigned int flags, unsigned int event_f_flags)
 static inline int fanotify_mark(int fanotify_fd, unsigned int flags, uint64_t mask,
                                 int dfd, const char *pathname) {
 #if defined _MIPS_SIM && _MIPS_SIM == _MIPS_SIM_ABI32 || defined __powerpc__ && !defined __powerpc64__ \
-	|| defined __arm__ && !defined __aarch64__
+    || defined __arm__ && !defined __aarch64__
         union {
                 uint64_t _64;
                 uint32_t _32[2];

src/systemctl/systemctl.c

@@ -3444,7 +3444,7 @@ static int show_one(const char *verb, DBusConnection *bus, const char *path, boo
                         r = 1;
                 else
                         r = 3;
-	}
+        }
 
         while ((p = info.exec)) {
                 LIST_REMOVE(ExecStatusInfo, exec, info.exec, p);