Fix broken overflow check in posix_fallocate [BZ 18873]

* sysdeps/posix/posix_fallocate.c (posix_fallocate):
* sysdeps/posix/posix_fallocate64.c (__posix_fallocate64_l64):
Fix parenthesization typo.

ChangeLog

@@ -1,3 +1,11 @@
+2015-08-31  Paul Eggert  <eggert@cs.ucla.edu>
+
+	[BZ #18873]
+	Fix broken overflow check in posix_fallocate
+	* sysdeps/posix/posix_fallocate.c (posix_fallocate):
+	* sysdeps/posix/posix_fallocate64.c (__posix_fallocate64_l64):
+	Fix parenthesization typo.
+
 2015-08-28  Mike Frysinger  <vapier@gentoo.org>
 
 	[BZ #18887]

NEWS

@@ -12,7 +12,7 @@ Version 2.23
   2898, 14341, 15786, 16141, 16517, 16519, 16520, 16734, 16973, 17787,
   17905, 18084, 18086, 18240, 18265, 18370, 18421, 18480, 18525, 18610,
   18618, 18647, 18661, 18674, 18681, 18778, 18781, 18787, 18789, 18790,
-  18795, 18796, 18820, 18823, 18824, 18863, 18887.
+  18795, 18796, 18820, 18823, 18824, 18863, 18873, 18887.
 
 * The obsolete header <regexp.h> has been removed.  Programs that require
   this header must be updated to use <regex.h> instead.

sysdeps/posix/posix_fallocate.c

@@ -37,7 +37,7 @@ posix_fallocate (int fd, __off_t offset, __off_t len)
 
   /* Perform overflow check.  The outer cast relies on a GCC
      extension.  */
-  if ((__off_t) ((uint64_t) offset) + ((uint64_t) len) < 0)
+  if ((__off_t) ((uint64_t) offset + (uint64_t) len) < 0)
     return EFBIG;
 
   /* pwrite below will not do the right thing in O_APPEND mode.  */

sysdeps/posix/posix_fallocate64.c

@@ -37,7 +37,7 @@ __posix_fallocate64_l64 (int fd, __off64_t offset, __off64_t len)
 
   /* Perform overflow check.  The outer cast relies on a GCC
      extension.  */
-  if ((__off64_t) ((uint64_t) offset) + ((uint64_t) len) < 0)
+  if ((__off64_t) ((uint64_t) offset + (uint64_t) len) < 0)
     return EFBIG;
 
   /* pwrite64 below will not do the right thing in O_APPEND mode.  */