Btrfs-progs: fix several complie warning

This patch fixed the following warning:
cmds-send.c:464:6: warning: ‘ret' may be used uninitialized in this function [-Wuninitialized]
crc32c.c:121:1: warning: control reaches end of non-void function [-Wreturn-type]
send-utils.c:69:11: warning: ‘comp' may be used uninitialized in this function [-Wuninitialized]
send-utils.c:126:6: warning: ‘comp' may be used uninitialized in this function [-Wuninitialized]
send-utils.c:99:22: warning: ‘entry' may be used uninitialized in this function [-Wuninitialized]
btrfs.c:261:2: warning: implicit declaration of function ‘crc32c_optimization_init' [-Wimplicit-function-declaration]
btrfs.c:105:2: warning: ‘cmd' may be used uninitialized in this function [-Wuninitialized]
restore.c:435:12: warning: ignoring return value of ‘ftruncate', declared with attribute warn_unused_result [-Wunused-result]

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/crc32c.c b/crc32c.c
index a761a1d2..c285d6e3 100644
--- a/crc32c.c
+++ b/crc32c.c
@@ -113,7 +113,7 @@ void crc32c_intel_probe(void)
 	}
 }
 
-int crc32c_optimization_init(void)
+void crc32c_optimization_init(void)
 {
 	crc32c_intel_probe();
 	if (crc32c_intel_available)
@@ -121,7 +121,7 @@ int crc32c_optimization_init(void)
 }
 #else
 
-int crc32c_optimization_init(void)
+void crc32c_optimization_init(void)
 {
 }