Fix got command (#531)

* fix find_lower_boundary in memory

* fix got cmd, correct base address calculation

pwndbg/commands/got.py

@@ -33,7 +33,7 @@ def got(name_filter=''):
         return
 
     if "PIE enabled" in pie_status:
-        bin_text_base = pwndbg.memory.page_align(pwndbg.elf.entry())
+        bin_text_base = pwndbg.vmmap.find(pwndbg.elf.entry()).start
 
     relro_color = message.off
     if 'Partial' in relro_status:

pwndbg/memory.py

@@ -359,7 +359,7 @@ def find_lower_boundary(addr, max_pages=1024):
             if addr < 0:
                 break
     except gdb.MemoryError:
-        pass
+        addr += pwndbg.memory.PAGE_SIZE
     return addr