Use xmalloc rather than malloc

As far as I can tell, the following comment is false nowadays.
/* Calls to m-alloc get turned by sed into xm-alloc.  */

Remove it, and call xmalloc.

	* ldlex.l (yy_create_string_buffer): Use xmalloc rather than malloc.
	* lexsup.c (parse_args): Likewise.

ld/ChangeLog

@@ -1,3 +1,8 @@
+2020-08-03  Alan Modra  <amodra@gmail.com>
+
+	* ldlex.l (yy_create_string_buffer): Use xmalloc rather than malloc.
+	* lexsup.c (parse_args): Likewise.
+
 2020-08-03  Alan Modra  <amodra@gmail.com>
 
 	PR 26328

ld/ldlex.l

@@ -515,14 +515,13 @@ yy_create_string_buffer (const char *string, size_t size)
 {
   YY_BUFFER_STATE b;
 
-  /* Calls to m-alloc get turned by sed into xm-alloc.  */
-  b = malloc (sizeof (struct yy_buffer_state));
+  b = xmalloc (sizeof (struct yy_buffer_state));
   b->yy_input_file = 0;
   b->yy_buf_size = size;
 
   /* yy_ch_buf has to be 2 characters longer than the size given because
      we need to put in 2 end-of-buffer characters.  */
-  b->yy_ch_buf = malloc ((unsigned) (b->yy_buf_size + 3));
+  b->yy_ch_buf = xmalloc ((size_t) b->yy_buf_size + 3);
 
   b->yy_ch_buf[0] = '\n';
   strcpy (b->yy_ch_buf+1, string);

ld/lexsup.c

@@ -617,7 +617,7 @@ parse_args (unsigned argc, char **argv)
   longopts = (struct option *)
       xmalloc (sizeof (*longopts) * (OPTION_COUNT + 1));
   really_longopts = (struct option *)
-      malloc (sizeof (*really_longopts) * (OPTION_COUNT + 1));
+      xmalloc (sizeof (*really_longopts) * (OPTION_COUNT + 1));
 
   /* Starting the short option string with '-' is for programs that
      expect options and other ARGV-elements in any order and that care about