[PATCH] ia64: ia32 emulation layer bug fix

sys32_mprotect code isn't dropping ia32_mmap_sem before returning. This
affects both 2.4 and 2.5.

arch/ia64/ia32/sys_ia32.c

@@ -618,7 +618,8 @@ sys32_mprotect (unsigned int start, unsigned int len, int prot)
 			/* end address is 4KB aligned but not page aligned. */
 			retval = mprotect_subpage(PAGE_START(end), prot);
 			if (retval < 0)
-				return retval;
+				goto out;
+
 			end = PAGE_START(end);
 		}
 		retval = sys_mprotect(start, end - start, prot);