tree-wide: fix typo

src/basic/math-util.h

@@ -9,6 +9,6 @@
  * The argument must be a floating point, i.e. one of float, double, or long double. */
 #define iszero_safe(x) (fpclassify(x) == FP_ZERO)
 
-/* To avoid x == y and triggering compile warning -Wfloat-equal. This retuns false if one of the argument is
+/* To avoid x == y and triggering compile warning -Wfloat-equal. This returns false if one of the argument is
  * NaN or infinity. One of the argument must be a floating point. */
 #define fp_equal(x, y) iszero_safe((x) - (y))

src/resolve/resolved-dns-transaction.c

@@ -1920,7 +1920,7 @@ static int dns_transaction_make_packet_mdns(DnsTransaction *t) {
                 ancount = be16toh(DNS_PACKET_HEADER(p)->ancount);
         }
 
-        /* Then, create acctual packet. */
+        /* Then, create actual packet. */
         p = dns_packet_unref(p);
         r = dns_packet_new_query(&p, t->scope->protocol, 0, false);
         if (r < 0)

src/sleep/sleep.c

@@ -304,7 +304,7 @@ static int execute_s2h(const SleepConfig *sleep_config) {
                         assert(previous_discharge_rate != 0);
                         suspend_interval = usec_sub_unsigned(last_capacity * USEC_PER_HOUR / previous_discharge_rate, 30 * USEC_PER_MINUTE);
                         /* The previous discharge rate is stored in per hour basis so converted to minutes.
-                         * Substracted 30 minutes from the result to keep a buffer of 30 minutes before battery gets critical */
+                         * Subtracted 30 minutes from the result to keep a buffer of 30 minutes before battery gets critical */
                 }
                 log_debug("Set timerfd wake alarm for %s", FORMAT_TIMESPAN(suspend_interval, USEC_PER_SEC));
                 /* Wake alarm for system with or without battery to hibernate or estimate discharge rate whichever is applicable */

src/test/test-copy.c

@@ -66,7 +66,7 @@ TEST(copy_tree_replace_file) {
         assert_se(write_string_file(src, "bar bar", WRITE_STRING_FILE_CREATE) == 0);
         assert_se(write_string_file(dst, "foo foo foo", WRITE_STRING_FILE_CREATE) == 0);
 
-        /* The file exists- now overwite original contents, and test the COPY_REPLACE flag. */
+        /* The file exists- now overwrite original contents, and test the COPY_REPLACE flag. */
 
         assert_se(copy_tree(src, dst, UID_INVALID, GID_INVALID, COPY_REFLINK) == -EEXIST);