Simplify handling of segments and segalign

Slightly simplify the handling of segment number allocation.
If we are in absolute space, never push a segalign down to the backend.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

nasm.c

@@ -343,8 +343,6 @@ int main(int argc, char **argv)
     preproc = &nasmpp;
     operating_mode = OP_NORMAL;
 
-    seg_init();
-
     /* Define some macros dependent on the runtime, but not
        on the command line. */
     define_macros_early();
@@ -1291,8 +1289,10 @@ static void assemble_file(char *fname, StrList **depend_ptr)
                                            "segment alignment `%s' is not power of two",
                                             value);
                             }
+
                             /* callee should be able to handle all details */
-                            ofmt->sectalign(location.segment, align);
+			    if (location.segment != NO_SEG)
+			      ofmt->sectalign(location.segment, align);
                         }
                     }
                     break;

nasmlib.c

@@ -391,16 +391,14 @@ int64_t readstrnum(char *str, int length, bool *warn)
     return charconst;
 }
 
-static int32_t next_seg;
-
-void seg_init(void)
-{
-    next_seg = 0;
-}
-
 int32_t seg_alloc(void)
 {
-    return (next_seg += 2) - 2;
+    static int32_t next_seg = 0;
+    int32_t this_seg = next_seg;
+
+    next_seg += 2;
+
+    return this_seg;
 }
 
 #ifdef WORDS_LITTLEENDIAN