unprotected references to partial symtab (core dump fix)

[Bob <innadadadavida at yahoo dot com>]

This problem is reported against gdb 4.18 but remains in the 5.0 source
(which I haven't yet built successfully...)

Most references to "pst" in gdb/partial-stab.h are protected by "if (pst)"
equivalents, but two aren't.  (A third instance has been fixed in 5.0.)


*** partial-stab.h-ORIG Sun Jun 28 14:36:50 1998
--- partial-stab.h      Fri Jun 16 14:53:39 2000
***************
*** 592,596 ****
                 the partial symbol table.  */
              if (textlow_not_set
!                 || (CUR_SYMBOL_VALUE < pst->textlow
                      && CUR_SYMBOL_VALUE
                           != ANOFFSET (section_offsets, SECT_OFF_TEXT)))
--- 592,596 ----
                 the partial symbol table.  */
              if (textlow_not_set
!                 || (pst && CUR_SYMBOL_VALUE < pst->textlow
                      && CUR_SYMBOL_VALUE
                           != ANOFFSET (section_offsets, SECT_OFF_TEXT)))
***************
*** 638,642 ****
                 the partial symbol table.  */
              if (textlow_not_set
!                 || (CUR_SYMBOL_VALUE < pst->textlow
                      && CUR_SYMBOL_VALUE
                           != ANOFFSET (section_offsets, SECT_OFF_TEXT)))
--- 638,642 ----
                 the partial symbol table.  */
              if (textlow_not_set
!                 || (pst && CUR_SYMBOL_VALUE < pst->textlow
                      && CUR_SYMBOL_VALUE
                           != ANOFFSET (section_offsets, SECT_OFF_TEXT)))


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#0  0xa11b8 in read_dbx_symtab (section_offsets=0x2c5868, objfile=0x264750, 
    text_addr=223256, text_size=817312) at partial-stab.h:593
#1  0x9f488 in dbx_symfile_read (objfile=0x264750, section_offsets=0x2c5868,
mainline=0)
    at dbxread.c:583
#2  0xa33c8 in elfstab_build_psymtabs (objfile=0x264750,
section_offsets=0x2c5868, 
    mainline=0, staboffset=3378038, stabsize=2509536, stabstroffset=2460208, 
    stabstrsize=3378037) at dbxread.c:2630
#3  0xa6cec in elf_symfile_read (objfile=0x264750, section_offsets=0x2c5868,
mainline=0)
    at elfread.c:664
#4  0x62100 in syms_from_objfile (objfile=0x264750, addr=4013948928,
mainline=0, verbo=0)
    at symfile.c:598
#5  0x62330 in symbol_file_add (
    name=0x280b34 "", from_tty=0, 
    addr=4014172184, mainline=0, mapped=0, readnow=0, user_loaded=0,
is_solib=1)
    at symfile.c:743
#6  0x78f5c in symbol_add_stub (arg=0x280b10) at solib.c:1040
#7  0xd6b84 in catch_errors (func=0x78e88 <symbol_add_stub>, args=0x280b10, 
    errstring=0x151198 "Error while reading shared library symbols:\n",
mask=3)
    at top.c:558
#8  0x791d0 in solib_add (
    arg_string=0x280b34 "", from_tty=0, 
    target=0x78c00) at solib.c:1176
#9  0x69bf4 in wait_for_inferior () at infrun.c:2082
#10 0x68d94 in proceed (addr=0, siggnal=TARGET_SIGNAL_0, step=0) at
infrun.c:922
#11 0x7da68 in procfs_create_inferior (exec_file=0x1b7638 "", 
    allargs=0x1dee08 "", env=0x1bed68)
    at procfs.c:5522
#12 0x8a3d4 in sol_thread_create_inferior (exec_file=0x1b7638 "", 
    allargs=0x1dee08 "", env=0x1bed68)
    at sol-thread.c:831
#13 0x8cd54 in find_default_create_inferior (
    exec_file=0x1b7638 "", 
    allargs=0x1dee08 "", env=0x1bed68)
    at target.c:1080
#14 0x66ef8 in run_command (args=0x1b5cda "", 
    from_tty=1) at infcmd.c:259
#15 0xd7914 in execute_command (p=0x1b5cff "b", from_tty=1) at top.c:1268
#16 0xd7b00 in command_loop () at top.c:1365
#17 0xdf40c in main (argc=3, argv=0xeffff714) at main.c:635

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