detect-engine-address: initialize pointer in unit tests

To prevent the compiler warning about "c" being used uninitialized
with LTO.

(cherry picked from commit 0e80aca3c3)

src/detect-engine-address.c

@@ -4362,7 +4362,7 @@ static int AddressTestCutIPv401(void)
 
 static int AddressTestCutIPv402(void)
 {
-    DetectAddress *a, *b, *c;
+    DetectAddress *a, *b, *c = NULL;
     a = DetectAddressParseSingle("1.2.3.0/255.255.255.0");
     b = DetectAddressParseSingle("1.2.2.0-1.2.3.4");
 
@@ -4386,7 +4386,7 @@ error:
 
 static int AddressTestCutIPv403(void)
 {
-    DetectAddress *a, *b, *c;
+    DetectAddress *a, *b, *c = NULL;
     a = DetectAddressParseSingle("1.2.3.0/255.255.255.0");
     b = DetectAddressParseSingle("1.2.2.0-1.2.3.4");
 
@@ -4417,7 +4417,7 @@ error:
 
 static int AddressTestCutIPv404(void)
 {
-    DetectAddress *a, *b, *c;
+    DetectAddress *a, *b, *c = NULL;
     a = DetectAddressParseSingle("1.2.3.3-1.2.3.6");
     b = DetectAddressParseSingle("1.2.3.0-1.2.3.5");
 
@@ -4449,7 +4449,7 @@ error:
 
 static int AddressTestCutIPv405(void)
 {
-    DetectAddress *a, *b, *c;
+    DetectAddress *a, *b, *c = NULL;
     a = DetectAddressParseSingle("1.2.3.3-1.2.3.6");
     b = DetectAddressParseSingle("1.2.3.0-1.2.3.9");
 
@@ -4480,7 +4480,7 @@ error:
 
 static int AddressTestCutIPv406(void)
 {
-    DetectAddress *a, *b, *c;
+    DetectAddress *a, *b, *c = NULL;
     a = DetectAddressParseSingle("1.2.3.0-1.2.3.9");
     b = DetectAddressParseSingle("1.2.3.3-1.2.3.6");
 
@@ -4511,7 +4511,7 @@ error:
 
 static int AddressTestCutIPv407(void)
 {
-    DetectAddress *a, *b, *c;
+    DetectAddress *a, *b, *c = NULL;
     a = DetectAddressParseSingle("1.2.3.0-1.2.3.6");
     b = DetectAddressParseSingle("1.2.3.0-1.2.3.9");
 
@@ -4540,7 +4540,7 @@ error:
 
 static int AddressTestCutIPv408(void)
 {
-    DetectAddress *a, *b, *c;
+    DetectAddress *a, *b, *c = NULL;
     a = DetectAddressParseSingle("1.2.3.3-1.2.3.9");
     b = DetectAddressParseSingle("1.2.3.0-1.2.3.9");
 
@@ -4569,7 +4569,7 @@ error:
 
 static int AddressTestCutIPv409(void)
 {
-    DetectAddress *a, *b, *c;
+    DetectAddress *a, *b, *c = NULL;
     a = DetectAddressParseSingle("1.2.3.0-1.2.3.9");
     b = DetectAddressParseSingle("1.2.3.0-1.2.3.6");
 
@@ -4598,7 +4598,7 @@ error:
 
 static int AddressTestCutIPv410(void)
 {
-    DetectAddress *a, *b, *c;
+    DetectAddress *a, *b, *c = NULL;
     a = DetectAddressParseSingle("1.2.3.0-1.2.3.9");
     b = DetectAddressParseSingle("1.2.3.3-1.2.3.9");