Prevent an implicit int promotion in malloc/tst-alloc_buffer.c

According to ISO C11, section 6.5.3.3 "Unary arithmetic operators", the
result of the ~ operator is the bitwise complement of its (promoted)
operand.
This can lead to a comparison of a char with another integer type.

Tested on powerpc, powerpc64 and powerpc64le.

	* malloc/tst-alloc_buffer.c (test_misaligned): Cast to char
	before comparing with another char.

1 files changed, 5 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index b213e7c..9e19f62 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2017-06-26  Tulio Magno Quites Machado Filho  <tuliom@linux.vnet.ibm.com>
+
+	* malloc/tst-alloc_buffer.c (test_misaligned): Cast to char
+	before comparing with another char.
+
 2017-06-25  Rical Jasan  <ricaljasan@pacific.net>
 
 	* manual/math.texi: Fix a grammatical error.